It's kinda hard to find unbranded clothing out there, from what I can see. A lot of schools here in San Diego have moved to uniforms (my Middle School was one) and Dress Codes are always in effect in schools in America, really.

Honestly, people will find something else to do this over as there's some incessant desire for most people I meet to prove themselves better than you in any way they can. It just so happens to be that they're into flaunting the fact that they spend so much money on clothes at the moment.