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The top was often shortened to reveal the midriff, while the skirt was dramatically long. Sneakers were worn instead of loafers. The uniforms were often decorated with gang symbols and other markers of street status. Sometimes long duster style coats were worn and these were also decorated.
Books and Movies
Kamikaze girls (novel, film, and manga)
Reference Links
Remembering Japan’s badass 70s schoolgirl gangs
How Vicious Schoolgirl Gangs Sparked a Media Frenzy in Japan