think you're a little out of touch there mate, she was wearing a crop top, not a bra or bikini top, it wasn't revealing or offensive in anyway. Best approach from the airline would have been hey, it can get cold up there, you might want to have a warmer top available". Not, "what you're wearing is too revealing"
If a guy rocks up with no top on, then he can expect to be asked to put a top on, but if he was wearing a tank top or singlet then no fuss.
rocking around naked is breaking the law....so noone can get away with that.