Sometimes they go overboard. My friend's eldest daughter attends a public high-school with a "zero tolerance" rule for bare midriffs. In the library, she reached up to take a book from a high shelf--and exposed skin briefly around the midriff. Whammo--detention for her, no arguments.
Me, I think it unfair.
--Boris
Girls exposing body parts in high school can be very bad for one's GPA. In 8th grade I was fortunate enough to have the best looking girl in school sit next to me in one class. She wore button-down shirts with the first 3 or 4 buttons undone, and she hadn't yet discovered the bra.
Needless to say, I don't even vaguely remember what the teacher looked like, let alone what he/she taught.
It sounds like she needs to wear shirts that can be tucked in.