The interviewer wants to hear that you can put together a fashionable outfit without much effort. This question is another good reason to walk the store before your interview. Additionally, checkout Nordstrom's 'Looks" where you can "get inspired by stylist-curated outfits for all occasions." You want to go into your interview familiar with their product offerings, paying attention to the labels of those product lines and designers. Stick to a style that you love and appreciate, while giving fun facts about the items you choose for your ensemble. Share why you chose them, whether it would be interchangeable with other items and accessories you own, or is something entirely new. But most importantly, have fun, and showcase your personality.