I'm fairly picky when it comes to clothes. Given a choice between a brand name and non-brand name item, I'll generally pick the former - not because I want to show off, but my shopping philosophy tends to be "you get what you pay for". Many stores I shop at are out of my price range unless I buy the items on sale. For example, Lucky Brand is too expensive for me, but they regularly offer deep discounts and I have a good-sized collection of their stuff because 50-60% off of "expensive" is "relatively affordable". I like the quirky and often Eastern-themed designs on their shirts and tops as well.
Most of my clothes come from Express, Lucky, Victoria's Secret, Urban Outfitters, etc. I generally gravitate towards t-shirts with artsy designs (abstract graphic tees, etc) or ones related to my interests, and I also have a large collection of random video game-themed and other shirts that I have bought online.