I dunno what kind you want, sports team, plain, etc. I personally would just go to a mall, saves on shipping, but the google directory is a good place to start, the casual topic has some stores too.
You are in my stomping grounds bro! You don't need to go online for your college clothes. Go to Marshalls in Raleigh. It is on Glenwood drive. Very easy to get to on the Raleigh beltline. You can also go to the Rugged Wearhouse in Cary. It is on Buck Jones Road. Also easy to get to from the beltline. Welcome to the area.
I'm 30 years old, so I'm not up to date on what is hot for college kids. I would guess Hilfiger is still pretty popular. Chapel Hill is a nice place. You will really enjoy your stay there.