The way my ds goes through knees, they would have to be made of Kevlar to resist his wear and tear.
DD1 will only wear Culottes, winter or summer.
DD2 wears joggers because she is 8 and in nappies and no other trousers will go over them and she can't wear a skirt because she bum-shuffles and it rides up and shows her nappies.
So I hate school uniform!