I've just been looking at that and thinking that any claim to gender-neutrality would need to allow that trousers and skirts are not gendered and that anyone can wear whichever they choose. What the school is doing is saying that boys' clothes are not gendered and thus neutral, which is like saying only girls possess gender, white people don't have race, RP isn't an accent, hetero isn't a sexuality and all that old guff. In conclusion, aaaaaaaaargh!