I went to a public co-ed high school.
In my final year, a few girls transferred from an all-girl's Catholic school to our high school. The girls who chose to transfer and were accepted, were high achievers. Yes, of course it gave them the freedom to dress to their own liking at our school. I don't recall any of these girls wearing stuff that would be on par with crop tops, etc. while in school.

A bit off topic: What was obvious even to me, along with my current female classmates who were also high academic achievers, etc., was the level of self-confidence of these former all-girl migrants had in their verbal self-expression, etc. I do believe for girls, an all-girl school with uniform requirements, if the curriculum is challenging can help (some) girls develop good self-confidence without overly relying on validation from guys at school. But the hormones at that age, just can distract even the best. Well, you know what I mean.

I graduated from high school in 1978. During my first year in HS, girls were finally allowed to wear jeans. I remember kneeling in hallway along with other girls in my class, so that (female) teacher could check our hemlines were knee-length.