Related, laws being passed to protect people from being discriminated against on the basis of their hair.
https://apnews.com/article/hairstyle-texture-discrimination-race-and-ethnicity-d6fd44b0226d4cd2d089953972377654
Honestly just fuck everything about sumptuary laws.
Wouldn't be surprised if they had similar limitations on jewelry, skirts, and dresses that arbitrarily limit only boy's options (and I suspect they would probably apply those rules to trans girls as well). Its almost like its more about boomers trying to enforce their weird traditional gender and racial norms onto people rather than actually trying to make an healthy learning environment.
And at the same time they're harassing girls with rulers and berating them for having a bra strap showing.
Like there's some arguments to be made for dress codes, but very few good ones.
But that's probably because teens dressed like that distract them and that makes them look bad, but its definitely the underaged girls fault for dressing that way. /s