GReporter: the Gyaru Styling Notebook correspondent (in partnership with i-gal.com — essayistic on cultural background, objective on the scoring)
Not current popularity, not "who's trending right now" — we broke influence into six criteria: style invention, cross-genre ripple, social-phenomenon status, and transhistorical reference. This isn't a declaration of the "greatest gyaru culture icon"; it's a ranking, by our own yardstick, of
how much each entry built the prototype for the gal look that followed and how far it rippled into other genres.
Change the yardstick and the order moves (try the lenses below). Where this piece covers real people, entries never touch their private lives — only the phenomenon or style they came to embody is evaluated.
How This Ranking Was Built (Methodology)
To avoid reducing "the influence of gyaru culture" to a single word, we broke it into six independent criteria and combined them with weights (total = Σ(score × weight)/100). Current name recognition and "who's popular right now" are not among the criteria.
Criterion
What it measures
Weight
Style Invention
How much it built the prototype — and the branching foundation — for the gal look that followed
24%
Cross-Genre Ripple
How far it rippled outward — into J-fashion, cosmetics, music, youth slang, and beyond
20%
Social-Phenomenon Status
Was it recorded as a social event — media coverage, buzzword-of-the-year selection, and the like
14%
Transhistorical Reference
Did it outlast its own moment — is it still being referenced repeatedly, from later years through today
20%
Contemporary Iconicity
How strongly it symbolized its own era at its peak
12%
Stylistic Distinctiveness
Does it stand out visually and structurally against similar candidates
10%
Normalization Rule
Current name recognition, social-media mention counts, and present-day popularity are not among the criteria. Subjects recently rediscovered or reinterpreted (the Y2K Revival, Reiwa Gyaru) are scored conservatively on "transhistorical reference," flagged flags=era-adjusted.
Scope & Unit
Crosses the people, phenomena, styles, magazines, and speech patterns that carried gyaru culture from Heisei into Reiwa. Unit = a gyaru culture icon. Entries naming real people evaluate only the phenomenon or style they came to embody — never their private lives.
Data Sources
Founding years are checked against periodical bibliographic records from the National Diet Library Search; award terms against the official Shingo Ryukogo Taisho (Buzzword of the Year) site; and opening/product histories against each operator's official materials, as primary sources. Where a primary source could not be reached, the source note flags that explicitly, and the body text sticks to qualitative language. No text reproduced from other sites' gyaru features.
Compiled / Subjectivity
2026-07-01. Judging style invention and transhistorical reference involves editorial judgment. uncertain = Shiro Gyaru, Deko-Den Culture, the magazine Cawaii!, and Gyaru-sa.
Switch the evaluation lens — changing the weights moves the ranking (recalculated from the same evidence, the same scores)
Overall Ranking
★ First Edition
Where the Conventional Wisdom Breaks
① The conventional wisdom says an icon with Ayumi Hamasaki's name recognition shouldn't stop at #7 instead of #1 — on this axis, she lands at #7. Her contemporary iconicity (9) comes close to the top tier even by our yardstick, but her style invention (7) falls just short of Kogyaru and Namie Amuro (both 9). "Symbolizing your era" and "inventing the style everyone after you references" are different questions.
② Loose Socks, a single item, stops at #14. Its distinctiveness and contemporary iconicity are high, but it functioned less as an inventor of a whole styling system and more as one component that perfected the kogyaru look.
③ Gyaru-go — neither a visual style nor a person — makes it to #8. Its cross-genre ripple and social-phenomenon scores are both high; because our criteria don't depend on visual style, a design like this is exactly what surfaces it.
④ The Y2K Revival and Reiwa Gyaru — the most talked-about subjects right now — sink to #19 and #20. Both are scored conservatively on "transhistorical reference" under era_rule; present-day buzz itself isn't one of the criteria.
How the View Changes With the Weights (Sub-Views)
Lens
#1
Biggest movers
What it shows
Default (Style Invention × Cross-Genre Ripple)
Namie Amuro (the Amura Phenomenon) 8.86
—
Weighs inventing the prototype and rippling into other genres together
Style-Invention Weighted
Namie Amuro (the Amura Phenomenon) 8.89
Yamanba/Manba rises #11→#8. The Y2K Revival falls #19→#23
Measures only whether it invented the style itself
Cross-Genre-Ripple Weighted
Namie Amuro (the Amura Phenomenon) 8.89
The Y2K Revival rises #19→#15; Yamanba/Manba falls #11→#16
Measures only ripple that doesn't depend on visual style
Social-Phenomenon Weighted
Namie Amuro (the Amura Phenomenon) 9.29
Gyaru-sa rises #24→#21; Koakuma Ageha falls #6→#9
Measures only whether it drew media coverage or controversy
Transhistorical-Reference Weighted
Shibuya 109 (the Gyaru Mecca) 8.83 (takes over #1)
Namie Amuro falls #1→#3 (8.54). Reiwa Gyaru (#20→#22) and Deko-Den Culture (#22→#23) fall further still
The control-experiment lens: measures only whether it's still referenced today, in Reiwa
Caveats & Limitations
Each criterion's 0–10 score is an estimate based on the descriptions we gathered, and judging style invention and transhistorical reference in particular involves editorial judgment. Founding years and award years are stated definitively where confirmed against primary sources; where a primary source could not be reached, the source note flags that explicitly.
Era-Adjustment Flag: The Y2K Revival and Reiwa Gyaru are both flagged "era-adjusted" under era_rule. The length of their evaluation history could be revisited in the future.
Unverified Flag: Shiro Gyaru, Deko-Den Culture, the magazine Cawaii!, and Gyaru-sa are all flagged to note that primary sources on their definition, timing, and actual scope are thin.
This piece doesn't claim to declare a single "greatest gyaru culture icon" — it's an ordering under the criteria we've disclosed. The entries naming Namie Amuro and Ayumi Hamasaki evaluate only the phenomenon or style each came to embody, never their private lives. There is no intent whatsoever to criticize or provoke around body type or appearance.
That the combination of thin eyebrows, tanned skin, and platform boots became the prototype of the "original gyaru look" in the mid-1990s -- an account holding that the trend began with a song released in October 1995, peaked in 1996, and established the template of a checked mini skirt, black platform boots, tanned skin, long brown hair with shag layers, and thin eyebrows. Galture, "In the 1990s, kogal and Amuraa became a huge boom" https://galture.com/history/kogal-amurer.html / Note: because this is a secondary source, confidence is medium on its own. The framing of this as "the reference point for all subsequent styles" is the editorial judgement of this article
That "Amuraa" became a winning term at the Shingo / Ryukogo Taisho (New Words and Buzzwords Awards) -- the official list of winning terms for 1996 (the 13th awards), selected for "Gendai Yogo no Kiso Chishiki," lists "Amuraa" among the top ten. Jiyu Kokuminsha (official) https://www.jiyu.co.jp/singo/index.php?eid=00013 / Note: this article originally described this vaguely as "treated as top-ten class"; because the official site confirmed the category, this was corrected to "won a top-ten award" (the annual grand prize is a separate category)
The Amuraa phenomenon as an absolute symbol of the mid-1990s -- the timing of the trend's origin and peak, and the process by which imitators became known socially as "Amuraa." Wikipedia, "Amuraa" https://ja.wikipedia.org/wiki/%E3%82%A2%E3%83%A0%E3%83%A9%E3%83%BC / Note: this article originally planned to cite a serialized feature on Da Vinci Web as the source for this claim, but the body text could not be reached from this environment due to a 403 error, so it was replaced with a source that could be reached. The description as an "absolute symbol" is the editorial judgement of this article
That the influence extended beyond the music and hair-and-makeup industries to continue being referenced in the visual strategies of later female artists -- the process by which the fashion template spread nationwide starting from a music release can be confirmed from the account above, but no primary source tracing "reference in later artists' visual strategies" was reached (the editorial judgement of this article) https://galture.com/history/kogal-amurer.html
That Shibuya 109 is a building that opened in 1979 -- it opened on 28 April 1979 as "Fashion Community 109" and was renamed "SHIBUYA109" in 1989. Tokyu Group, Shibuya Photo Museum https://tokyu.shibuyaphotomuseum.jp/detail/1481/ / Note: because the SHIBUYA109 corporate profile page itself does not state the opening year, this article relied on the Tokyu side's record
That SHIBUYA109 lab.'s Generation Z trend forecasting continues today -- the company's research institute, SHIBUYA109 lab., has officially published a "Trend Forecast 2026," showing that this activity is still ongoing. SHIBUYA109 Entertainment (official) https://www.shibuya109.co.jp/shibuya109lab/reports/shibuya109-lab-%E3%83%88%E3%83%AC%E3%83%B3%E3%83%89%E4%BA%88%E6%B8%AC2026/
That trends originating from Shibuya 109 spread to shopping facilities nationwide -- a retrospective article marking the 35th anniversary of the building's opening reports how phenomena such as the "charisma sales staff" became a social phenomenon originating there. Shibuya Keizai Shimbun, "SHIBUYA109 marks 35th anniversary of opening, with social phenomena such as 'charisma sales staff'" https://www.shibukei.com/headline/10085/
That the "Shibuya 109 style" became the subject of nationwide media coverage -- a trade-press article reporting the building's first logo change in its 40th year discusses its nationwide recognition alongside the premise of a declining gyaru population. WWDJAPAN, "Shibuya 109 changes its logo for the first time in its 40th year, against a backdrop of declining gyaru numbers" https://www.wwdjapan.com/articles/599925
That the kogal style became the starting point for later branches -- how the combination of platform boots, loose socks, and tanned skin spread as the basic form of high school girls' fashion. Galture, "In the 1990s, kogal and Amuraa became a huge boom" https://galture.com/history/kogal-amurer.html / Note: the framing of this as "the starting point for every subsequent branch" is the editorial judgement of this article
That in the late 1990s it was reported in connection with enjo kosai (compensated dating) and became a social phenomenon -- the process by which it was widely reported as a social problem in 1996 and was also selected as a winning term at that year's Shingo / Ryukogo Taisho. Wikipedia, "Enjo kosai" https://ja.wikipedia.org/wiki/%E6%8F%B4%E5%8A%A9%E4%BA%A4%E9%9A%9B / Note: the original source of the reporting at the time (the body text of the 1996 serialized report in "Shukan Bunshun") was not reached; this article relies on an account of the events
That it is repeatedly looked back on in Heisei-retro contexts as the "original gyaru" -- the situation in which it continues to be taken up in later years as a symbol representing 1990s high school girls' culture. Livedoor News (Peachy), "Do you remember the symbol of the 1990s 'kogal'? The history of loose socks" https://news.livedoor.com/article/detail/11378698/
The distinctiveness of the kogal look as a combination -- the two sources above confirm the individual elements (platform boots, loose socks, tanned skin), but no primary source discussing "distinctiveness as a combination" in comparison with other candidates was reached (the editorial judgement of this article) https://galture.com/history/kogal-amurer.html
That the appearance of "Print Club" in 1995 was the starting point -- the developer itself states, in an announcement marking the "30th anniversary of purikura," that the first unit went into operation on 25 July 1995. Sega (official press release, 2025) https://www.sega.co.jp/release/250725_1.html
That purikura invented a self-presentation photo format built around "mori" (enhancing one's appearance) and connects to the lineage of selfie culture -- the mechanism and course of the trend. Wikipedia, "Print Club" https://ja.wikipedia.org/wiki/%E3%83%97%E3%83%AA%E3%83%B3%E3%83%88%E5%80%B6%E6%A5%BD%E9%83%A8 / Note: the connection itself to smartphone selfies and beauty-filter apps is the editorial judgement of this article
That print-sticker machines continue into the Reiwa era -- an article on the developer's re-entry into the market reports the continuation of the machines and the shift in the market. Toyo Keizai Online, "Why Sega, the originator of purikura, is 're-entering after 20 years'" https://toyokeizai.net/articles/-/406794
That the culture of pasting photos into "puri-cho" albums became a boom in the late 1990s -- the spread of this way of exchanging and collecting printed photos. Japan Patent Office's PR magazine "Tokkyo" (an issue introducing the patent for Print Club) https://www.jpo.go.jp/news/koho/kohoshi/vol47/07_page1.html / Note: this magazine covers the technology and the history of the invention; no primary source demonstrating the popularity of the "puri-cho" practice with statistics was reached
The stylistic feature of a reversed color scheme combining tanned skin with white makeup -- the formation of the style and the features involved. Wikipedia, "Ganguro" https://ja.wikipedia.org/wiki/%E3%82%AC%E3%83%B3%E3%82%B0%E3%83%AD / Note: the assessment that this was "an extreme style with no parallel" is the editorial judgement of this article
That ganguro was also reported by overseas media -- a British newspaper reported, in an article dated 4 April 2004, on a shift in young Japanese women's attitudes toward tanning. The Guardian, "Japanese girls choose whiter shade of pale" https://www.theguardian.com/world/2004/apr/04/japan.nicolemowbray / Note: this article originally described this as having been "widely reported by domestic and overseas media" as an event of the trend's peak period (around 1999-2000). The only overseas report that could be reached was this 2004 article, and its content actually reported the move "away from" ganguro. Because no overseas primary report from the peak period was reached, the article's statement of timing was softened
The branching from ganguro to yamanba -- the derivative relationship between the styles. Wikipedia, "Ganguro" https://ja.wikipedia.org/wiki/%E3%82%AC%E3%83%B3%E3%82%B0%E3%83%AD and Shibuya Keizai Shimbun, "'Verified! The emergence and decline of yamanba'" https://www.shibukei.com/special/118/
The retrospective symbolism of ganguro -- the situation in which it is treated as a symbolic moment when looking back on the history of Heisei-era gyaru. The British newspaper article above recorded, from a contemporaneous viewpoint, the trend's declining phase, and was referenced here as a source that indirectly reflects its earlier prominence https://www.theguardian.com/world/2004/apr/04/japan.nicolemowbray / Note: no primary or quasi-primary domestic retrospective article was reached (the editorial judgement of this article)
The 2006 launch of "Koakuma ageha" -- the National Diet Library's periodical bibliography records volume 1, issue 1 (overall issue 1) as registered for November 2006, published by Infrest. National Diet Library Search https://ndlsearch.ndl.go.jp/books/R100000002-I000009222876 / Note: this article originally stated "said to have launched in 2006" with a qualifier. Some secondary sources state that a predecessor special issue launched in 2005, but because the bibliographic volume numbering for "Koakuma ageha" itself begins in 2006, and this is the official launch record, 2006 was kept
That it drove the market for false eyelashes and colored contact lenses -- the establishment of the "mori makeup" category, and the course the magazine took, including its later relaunch. fashionsnap, "'Koakuma ageha' publisher relaunches under a new name, with popular models such as Emiri Aizawa also appearing" https://www.fashionsnap.com/article/2017-11-21/koakuma-ageha-venus/ / Note: no statistics showing the actual trajectory of market size were reached, so the text is limited to noting the market by name
The angle of building the magazine around hostess-affiliated reader models -- the process of cultivating a readership different from existing gyaru magazines, and its Reiwa-era relaunch as a web media outlet. KAI-YOU, "'Night butterflies,' in Reiwa taking flight online: 'Koakuma ageha' is revived as a web media outlet" https://kai-you.net/article/79261
Its symbolism in the early 2000s -- the person's career and their position during this period. Wikipedia, "Ayumi Hamasaki" https://ja.wikipedia.org/wiki/%E6%B5%9C%E5%B4%8E%E3%81%82%E3%82%86%E3%81%BF / Note: this article does not touch on the individual's private life, and evaluates only the phenomenon and style they embodied
That the makeup elements were carried forward into what followed -- a note on this influence within 2000s fashion history. This relies on the account above, but no primary source tracing the line of succession was reached (the editorial judgement of this article) https://ja.wikipedia.org/wiki/%E6%B5%9C%E5%B4%8E%E3%81%82%E3%82%86%E3%81%BF
That an individual icon and the systematic nature of a style were scored separately -- the editorial judgement of this article (no external source exists)
That "chouberiba" and related terms became winning words at the Shingo / Ryukogo Taisho -- the winning-term list for 1996 (the 13th awards) lists "chouberiba / chouberigu" among the top ten (the same year and category as "Amuraa"). Jiyu Kokuminsha (official) https://www.jiyu.co.jp/singo/index.php?eid=00013
The lineage from gyaru slang to later youth slang -- the award's history and the changes in the terms selected. Wikipedia, "Shingo / Ryukogo Taisho" https://ja.wikipedia.org/wiki/%E6%96%B0%E8%AA%9E%E3%83%BB%E6%B5%81%E8%A1%8C%E8%AA%9E%E5%A4%A7%E8%B3%9E / Note: no linguistics primary literature discussing the connection to "part of the lineage of later variety-show and SNS youth slang" was reached (the editorial judgement of this article)
That the manner of speaking itself became established as a style -- the award record above shows that the term achieved wide currency, but the framing that "it was not a visual style but a manner of speaking that became a style" is the editorial judgement of this article https://www.jiyu.co.jp/singo/index.php?eid=00013
That the role of "charisma sales staff" became established -- an interview with a former staff member conveys how, in the late 1990s, Shibuya 109 sales staff came to be called "charisma sales staff," with magazines running features on them. Gendai Business (Kodansha), "A former 'charisma sales staff' member at 109 talks about why girls went wild for '1990s Shibuya'" https://gendai.media/articles/-/73599
That it is cited as an origin of influencer marketing -- the establishment of a mechanism in which sales staff themselves became modeled figures. Livedoor News, "Shibuya 'Marukyu' is reborn: the people behind it reveal the inside story of the 'charisma sales staff boom'" https://news.livedoor.com/article/detail/16244537/ / Note: the framing as an "origin" is itself the editorial judgement of this article
That customers formed lines to visit particular staff members, and this was also covered as a feature on television -- the retrospective article marking the 35th anniversary of the building's opening treats this as a social phenomenon originating there. Shibuya Keizai Shimbun https://www.shibukei.com/headline/10085/
The 1995 launch of "egg" -- the National Diet Library's periodical bibliography records 1995 as the launch year (the original publisher was Million Publishing, later Taiyo Tosho). National Diet Library Search https://iss.ndl.go.jp/books/R100000002-I000000096842-00 / Note: this article originally stated "said to have launched in 1995" with a qualifier, but this was changed to a definite statement because it was confirmed in the bibliography
That, even after going out of print and being relaunched, it is still referred to as the "original" -- the course the magazine took. Wikipedia, "Egg (magazine)" https://ja.wikipedia.org/wiki/Egg_(%E9%9B%91%E8%AA%8C)
That it was a pioneer in building its pages around reader submissions and a reader-model system -- the editorial policy at the time of its Reiwa-era revival confirms the magazine's participatory character. fashionsnap, "The magazine egg is revived: what gyaru spirit does its 21-year-old editor-in-chief convey to the present day?" https://www.fashionsnap.com/article/egg-web/
The combination of white streaked hair, fluorescent-colored makeup, and platform sandals -- this arose in Shibuya in 1998, and was characterized by makeup that outlined the eyes in white together with primary-colored clothing and platform shoes. Shibuya Keizai Shimbun, "'Verified! The emergence and decline of yamanba'" (a feature linked to Kokugakuin University's "Shibuya Studies") https://www.shibukei.com/special/118/
The visual distinctiveness of yamanba / manba -- the verification article above records the concrete elements of the look https://www.shibukei.com/special/118/ / Note: the comparative assessment that this was "the most extreme in gyaru history" is the editorial judgement of this article
Coverage concentrated on Shibuya's Center Street -- the course from emergence to decline, and the background to why coverage concentrated on this location. The verification article above https://www.shibukei.com/special/118/
The period in which kuro gyaru spread as a style combined with tanning-salon visits -- the magazine's history over time confirms that the peak of ganguro / kuro gyaru falls in the late 1990s to early 2000s. Wikipedia, "Egg (magazine)" https://ja.wikipedia.org/wiki/Egg_(%E9%9B%91%E8%AA%8C) / Note: this article originally stated flatly that this "became established in the 2000s," but the source referenced does not specify this timeline explicitly, and because the peak spans the late 1990s, the wording on timing was changed to allow for a range
The stylistic continuity between kuro gyaru and Reiwa gyaru -- no primary source tracing the partial inheritance of the tanned-skin lineage into part of the Reiwa gyaru style was reached (the editorial judgement of this article). For the reassessment on the Reiwa gyaru side, an article from Senken Shimbun was referenced https://senken.co.jp/posts/gal-250604
That big-eye makeup spilled over into the 2010s Korean-cosmetics boom -- Korean-originated "'orutyan' (ulzzang) makeup" began attracting attention in Japan around 2010, and this covers the content and background of that trend. Gendai Business (Kodansha), "'Orutyan' makeup, a huge trend ten years ago -- what was it, ultimately? Looking back at the 'Korean cosmetics' boom" https://gendai.media/articles/-/141217 / Note: no source was reached showing that Japan's big-eye makeup using false eyelashes and colored contacts caused the trend on the Korean side; the text is limited to noting the overlap in timing and the spillover
That loose socks are remembered as a symbol of the mid-1990s kogal style -- this traces the lengthening of the socks from around 50 cm class around 1992 to around 180 cm class around 2000, positioning them as a symbol of 1990s kogal. Livedoor News (Peachy), "Do you remember the symbol of the 1990s 'kogal'? The history of loose socks" https://news.livedoor.com/article/detail/11378698/
That a single item and an overall style were scored separately -- the editorial judgement of this article (no external source exists)
The 1981 launch of CanCam -- an official article tracing the covers through the magazine's history shows it launched on 17 November 1981 (originally under the name "Can Campus," aimed at female college students). CanCam.jp (Shogakukan, official) https://cancam.jp/archives/1066210
That the "Ebi-chan OL" look became a trend in the mid-2000s and its system of turning reader models into celebrities spread to later magazines -- how the boom took off in earnest from the magazine's own serialized feature and continued until her "graduation" in the December 2008 issue (the peak was around 2005-2008). Bunshun Online https://bunshun.jp/articles/-/51112
That the hime style became established in the mid-2000s -- no primary source was reached showing the timing of the establishment of this branch, which combined Lolita-like ornamentation with a gorgeous color palette. As a rough guide to timing, this article referred to the 2006 launch of "Koakuma ageha," said to be the core of this style (the editorial judgement of this article) https://ndlsearch.ndl.go.jp/books/R100000002-I000009222876
The 1980 launch of Popteen and its current publishing format -- the magazine, launched in 1980, ended its print edition with the February 2023 issue (on sale 28 December 2022) and has since moved to the web magazine "Popteen media." fashionsnap https://www.fashionsnap.com/article/2023-02-01/popteen-web/ / Note: this article originally stated that it "has continued its reader-model system into the Reiwa era," wording that could be read as implying the print magazine is still published today. Because the print edition ceased in 2023, this was corrected to make explicit that it was carried over to the web edition
The distinctiveness of gyaru-o as a male gyaru style -- it arose in the late 1990s and spread alongside the launch of dedicated magazines, with its own distinct elements such as elaborately styled hair, different from the female side. Wikipedia, "Gyaru-o" https://ja.wikipedia.org/wiki/%E3%82%AE%E3%83%A3%E3%83%AB%E7%94%B7
That the Y2K revival is being reinterpreted via social media in the 2020s -- no primary source tracing the revival of items such as low-rise waistlines, platform shoes, and metallic materials was reached. As circumstantial context, an article covering the change in length and shape of 1990s items was referenced https://news.livedoor.com/article/detail/11378698/ / Note: the text is limited to a statement at the level of "reinterpretation is proceeding via social media," and does not state any figures indicating scale
That the era_rule was applied to the Y2K revival -- a statement of this article's editorial policy (no external source exists)
That a trade newspaper has reassessed Reiwa gyaru as "a vessel for self-expression" -- a trade-press article (published 4 June 2025) treating the reasons Generation Z is drawn to gyaru as an attitude symbolizing self-expression and confidence. Senken Shimbun, "Gyaru back in the spotlight! Exploring why Reiwa-era young people are drawn to it" https://senken.co.jp/posts/gal-250604 / Note: the article does not itself use the phrase "a vessel for self-expression"; this is this article's summary of its gist
That the era_rule was applied to Reiwa gyaru -- a statement of this article's editorial policy (no external source exists)
The launch timing of the magazine Cawaii! -- it launched in March 1996 from Shufunotomo and ceased publication with the June 2009 issue. Magazine Data https://magazine-data.com/women-magazine/cawaii.html / Note: this article had qualified that "sources vary on the launch year and the degree of its pioneering status." Because the launch year was confirmed as 1996, that qualifier was removed, but no primary source remains for comparing its pioneering status against egg, and it must be treated as a magazine distinct from the still-running "S Cawaii!"
That deco-den culture shrank with the shift to smartphones -- how the decoration of the phone body itself, which spread in the era of flip phones, moved to decorating cases instead, because smartphones expose the screen structurally. Wikipedia, "Decorated mobile phone" https://ja.wikipedia.org/wiki/%E3%83%87%E3%82%B3%E3%83%AC%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E6%90%BA%E5%B8%AF%E9%9B%BB%E8%A9%B1
That there is a range of variation across sources on the definition and timing of white gyaru -- no source was reached defining it as an independent style with a fixed timing (a dictionary site could not be retrieved from this environment, and other sources were only personal websites and summary pages). The fact that this article keeps its confidence qualified is itself judged appropriate (the editorial judgement of this article). For the ganguro side of the comparison, the source above was referenced https://ja.wikipedia.org/wiki/%E3%82%AC%E3%83%B3%E3%82%B0%E3%83%AD
That primary sources on gyaru-sa are thinner than for other candidates -- the description of gyaru circle activity in Shibuya is only a very short one, based on a slang dictionary and web news. Wikipedia, "Gyaru-sa" https://ja.wikipedia.org/wiki/%E3%82%AE%E3%83%A3%E3%83%AB%E3%82%B5%E3%83%BC / Note: this thinness itself is the reason this entry was flagged as uncertain