>>557883pretty much. 90s ganguro was trying to emulate the blonde tan surfer/baywatch look, with bleach blond or white/silver hair, deep dark tans, and white makeup meant to look like highlights or sunblock smears that surfer girls wore. a few years later like the very early 2000s, it became more cutesy and more colorful, featuring cute characters like stitch and hello kitty, and going for a relaxed, loungey, hawaiian look (including literally wearing bikinis and beach towels in public, as well as the standard school uniform with skirt tucked extra short)
after a while it became less silly/cute and more sexy and glamorous and mature, because a lot of hostesses started wearing the more refined version of gyaru to attract customers by looking expensive and well groomed.
ganguro fell out of favor because it became associated with school delinquency, not bathing (to preserve tans), using weird shit like paint markers and sequins for makeup, and generally being slutty or engaging in enjo-kosai which was looked down on but some ganguro girls did indeed do (as many were from lower income or troubled backgrounds and ganguro was seen as a complete rejection and inversion of japanese traditional beauty and feminity: dark skin, crazy hair colors, loud and obnoxious personalities, promiscuity etc).
a lot of the older gen 90s ganguro girls talked about being spat at, yelled at and called things like cockroaches while hanging out on the streets of tokyo, which eventually made them give up the style and become normal. it also attracted a lot of creepy men who thought it meant these girls would be easy or sleep with them for money.
i think the reason gyaru dwindled in popularity is because it also became associated with porn, hostessing and JAV titles. i guess a lot of gyarus just didnt want the stigma that came with looking too sexy in public anymore.