Actually OTW those are kind of soccer-y looking.
I think a lot of the dress-code enforcement depends on where you go to school as well. I'm from a small town/small high school and even if I would have snuck a miniskirt to school and changed, all the teachers who knew my parents (which was most of them) would have let them know. But now if the teachers say anything they'll more than likely get their asses handed to them by the parents instead of the parents agreeing.