As a male WAG coach, I never thought about the chaffing. Oww.
I have seen young rec and kinder girls wear their leos backwards. Generally I notice by the time we are doing our stretching. Most of the time their parent has been around to go fix it, they can, or another parent or female coach has helped out.
As a male MAG coach, I ABSOLUTELY hate it when my boys go commando whether they are in a singlet or just shorts. For the record, shorts can come off way too easily during rings or high bar swings or in the pit. Besides when stretching. Seriously, don't flash lil guys.
We actually had a problem at Berkeley's NAIGC club with some dude wearing a pair or way too short shorts. Some of the gals were gossipping. I think I interjected. Bad enough when the guy tried to changing with a towel covering in the sort of cubby/locker/storage area in the gym. Go to the bathroom dude, it's s'okay for the gals but not guys. Slightly worse than when one of the guys stripped down to his boxers on tramp. People are strange in Bezerkely, okay.
Seriously, pale light colored leo's for the girls? Never.