The problem with school uniforms, is that it does not allow students to express their feedom of speech. I understand some regulations like no drug support or ppromoting violence, but overall ppl should be able to wear whatever they want.
People can wear whatever they want, out of school. I'm kinda skeptic towards school uniforms but if the school says you have to wear uniforms while at school, they can do so, without going against your freedom of speech.
Also, people will always find other ways to differentiate themselves from others, they will thus always find ways to mob others. It's just more challenging with uniforms.
That's why I'm skeptic, I don't see a real advantage, but there's nothing really bad about them either..