Although I despise my school uniform with a passion, I must say that I think wearing a uniform is a good concept. It identifies a body of pupils well, and occasionally enhances the reputation of the school that wears it.
I mean, it's school. Uniform is just ONE more constraint that we have to deal with. And unless you have an opulent and large wardrobe where you never wear something twice in a term or month, casual wear at school is just a little absurd. I am biased - I must admit that, having only worn casual clothing to school on mufti or fundraiser days which number about four to seven every year - but it's just my opinion.