Backless Garments in School
I know as a rule that boys like to study a girl's back when its bared, but they study a girls face even more, so if a girl is to be required to keep her back totally covered, then why not cover her face as well!
Now for grammer school girls, they are not out to flash the little boys, and I don't think the boys at that age would pay any attention to a girls back since they are still at that "girls yuck!" stage! So what would be the big deal about wearing a halter top to school? We see girls wearing them in restrunts to clearly states "No Shoes, No Shirt, No Service".