I don't equate the hat issue with "covering boobs and butt," either. But this was a significant on-going issue at every school i worked at, no matter where it was, starting in about 1995.
And it is a personal pet peeve of mine. Does it matter in the total scheme of things? No, but it bugs me, seems just bad manners.
But hey, I wore white gloves to parties as a kid and I made my own kids write thank you notes and no jeans to religious school... you can call me old, or old fashioned, but despite my liberal attitude about most things in life, I think everyone just looked nicer and more put together back in the day (pre 1967 or so). I know a lot of people don't care and think it's silly, but generally, I do care about stuff like this.