Hrm...I have some suggestions.
For your idea...I don't see kids wearing that anymore...it was more of a 90s thing I suppose...so no ideas for that one.
Here's some of mine. I don't think you'll do them, though, haha.
1. Ghetto: Get a big jersey or big shirt, make sure it's baby blue. Or you could just be a wigger. Anyways, if you really wanted to pull it off, go get a baby blue South Pole shirt, or something from Phat Farm (I have no clue where they sell that but they sell South Pole at JCPennys). THen you could go with the backwards hat if you wanted, I dunno. And, get some really cheap big ice (a humongous siver necklace...with diamonds if you want it sorta real) and get some big-@%^ shoes, preferably Air-Force Ones. I'm probably forgetting some stuff, though.
2. Prep: Well, if you wanted to be a prep, which I doubt, but whatever, you could go get some really tight stuff. And glitter. And wear a lot of make-up. That's really all I can think of, even though I go to an extremely preppy school.
3. Punk/Goth: You could get some black stuff, well all black, and maybe a trenchcoat if you really wanna pull it off. And some spikes, black nail polish, maybe a studded belt. And safety pins. Decorate the clothes with safety pins. Myabe a little silver skull pin here and there.
That's all I can think of. Haha.