So you can't see who's in a gang? And as allready stated by others, small things can be used in the same way as i.e. colours.
What a dress code does, is kill of individualism.
and gang colors are banned by schools in those areas. also, you wouldn't be able to wear gang colors with a uniform, seeing as they'd all be the same color.
all US public schools
already have a dress code. a uniform wouldn't "kill individualism" but take away the focus on dress which can actually be pretty detrimental to the overall school experience so that kids can make thier mark in another way, perhaps academically.
there's definately division amongst different types of dress, I saw this every day since for most of my high school career I refused to believe that punk was dead, however when certain functions demanded we all dress more or less the same, a LOT of new communication was done between students of different groups, por ejemplo:
I was one of two "alternative" kids in an honors english class, I was pretty punked out and my friend was a big metalhead. the rest were mostly academics and whatnot, seeing as it was honors english(called AP english elsewhere). most of the time I wore clothes fit for skateboarding or various pieces from the army surplus, along with my mohawk and combat boots. my friend was always wearing cradle of filth t-shirts and whatnot, we kinda freaked everyone out, and yes, we kinda liked it that way. on a few occasions we had to go see plays(real plays not school plays) and this required us to dress nicely, so we wore slacks, button-ups, ties and nice shoes like everyone else was required to, I even combed down my mohawk(it was long enough for me to look normal when it was combed down). I enteracted a LOT more with my fellow students when that barrier of dress was taken down, I wasn't a different person and it didn't make me any less of an individual, but without that false separation I was able to interact with my fellow students quite a bit more, we were free to discuss the various parts of the play, during our lunch break I sat and chatted with quite a few girls who had thought me scary just the previous day, all sharind ideas on writing and books etc. perhaps I'm nuts, but I think this would be wonderful.
I have quite a few more examples than this strung about my years in highschool, but I can't be bothered to type them up. I think I've made my point anyway. Uniforms do indeed work and there's good reason a lot of schools do this with good results.
I'm all for it.