Talk about your previous experiences even if it's not in the retail industry. If you do volunteering in your spare time, make sure to let them know. Speak out in a group interview, but don't over do it.
Smart, professional outfit.
No heels, no tshirts, no Jean's, NO RUNNERS. Natural makeup
I wore a smart long sleeved white blouse (not low cut at all). Kinda looked like a shirt, and women's office trousers. With black shoes. And I got the job