aeropostale, and American Eagle outfitters are quite popular with teens and are quite affordable too
Marshalls and TJ Maxx. I honestly don't care what brand clothes are. If it looks good or professional and at a reasonable price I will buy it. My friend buys stuff from Goodwill but I don't trust them since some of the clothes that I inspected there are disgusting (cleanliness wise not design wise)
Try to find out places like Woodbury Outlets where you'll see a lot of selections... Good luck
Saks is ok