Modeling outfit? Please help!!!?

One of my favorite clothing stores is searching for someone to model their clothes, and my friend and I are going to submit our photos. I don't think I'm going to win or anything, but I figure it's worth a shot. You have to submit one headshot photo, and one full-body shot. I've never done modeling though, so I have absolutely no idea what to wear! Also, where should it be taken? Like outside or in a studio at JCPenney or Sears or something? I don't want to spend tons of money on this since I don't think I really have a chance, but I wouldn't mind buying a new outfit/new makeup. I just don't want to spend thousands. Any tips would be greatly appreciated! Thanks so much! :)