I look upon them as a leveller so for that reason I support the idea, I wonder if they weren't in place whether there would be a "shaming" of some by others if what they wear is deemed cheap. I can remember some of the banter from teen years for example "dresses like a tramp" apropos of the individual's "lowly trainers". Some kids of that age can pick on almost anything to victimise and clothes and shoes, I imagine could be used in such a way. Although observations from being in France and the US, I believe only very posh academies subscribe to uniforms there, I think I'd be interested to know whether they think what the have works.
Having said that my memories of my own convent senior school's stricture over uniforms was taken to the enth degree, regulation everything, including straw boaters in the summer white gloves going to and from school and woe betide us if we had any of it missing That left a feeling of load of bollocks! fatuous nonsense for me, but I think a looser approach to some sort of uniform is probably a good thing. When my children were in their infant school, at that time they hadn't adopted a uniform and I still had arguments with one of mine even at that age as to what he wanted to wear everyday, so I welcomed the basic uniform, school sweat shirt, white polo shirt underneath and standard grey trousers when he started in year 3 juniors, relief! I thought that at least made my life easier in the mornings.