What to wear, what to wear...

School uniform - skirts or trousers?  Used to be so simple - trousers for boys, skirts for girls,  But then you got girls who didn't like wearing skirts (my young granddaughter for one), and - particularly in this hot weather - boys who prefer to wear skirts. And this is before you start dealing with boys who identify as female - or vice versa. You would think that the obvious answer is to let kids decide for themselves what to wear, but then of course you come up against schools who demand the right to formulate their own uniform policy and to discipline any pupil who fails to comply.  It's a right mess!