ROFL, Taylor, I have been considering picking up a couple of shifts at Loft just for the discount. I loved that when I worked at Forth & Towne!
Trouser pants or a pencil skirt with a collared shirt and cardigan/vest would be good for a sales floor interview. Make sure you wear nice shoes and have a pretty bag. If you have ATL, wear that. Most of all, you want to look polished, that you show good attention to detail, and are friendly. Good luck!