For fabric try a ... fabric store. DIY is totally the way to go. You'd not believe what you could accomplish with some thread, some fabric and a sewing machine.
If you're a little worried about taking on designing your own clothes right off the bat, there are plenty of patterns out there, that are actually pretty cool, that you can use and learn to work with... and if you have the pattern you can make as many of whatever it is as you like.
Of course, I can totally understand not wanting your Juggalo friends to make fun of you for knowing how to sew.. Oh the embarrassment. *rolls eyes*