What should I wear for an interview?

It's at a Fossil outlet store (they sell watches, sunglasses, wallets, etc.) in Tanger Outlet Center. So I can't wear any clothes made by them. It's a group interview, which I am kinda nervous about. So I would like to make the best impression possible with the best clothes. Any ideas? I know not to be sloppy or just what I wear everyday, but I don't want to be overdressed. And I guess it helps that I also have a Fossil wallet and sunglasses. So help?