If I knew anything as well as I know how to find hoops-related clothing on the internet, I’d be very rich. These are links to some of my favorite sites:
Point3 Basketball – Evolution in Basketball Gear
Turntablelab – Pennant Race Clothes
Coolest T Shop (lots of retro shirts)
Eastbay (Sneakers, game wear, fan gear, etc.)
Kitson LA (they don’t primarily sell hoops-related clothing, but they have a few good items)