Yeah, it really bad.
If you've ever ridden the bus in a school with a uniform policy, it's obvious the girls are having a contest to see who can dress the s**tiest while still following the uniform policy (I.e. shortest, tightest shirt. Tight shirt unbuttoned low enough to show cleavage, ect.) And it gets worse in districts without a uniform policy. I say a girl in a tube top, bare midrift, shorty shorts with sides made of webbing.
Of course any attempt by the schools to enforce a dress code, even one with clearly stated guidelines that apply to both genders, is "sexist".