Whether you are applying for a position in one of their retail locations or at their corporate headquarters in Seattle, regardless of whether you are a regular once a month customer or an occasional once a year one, let them know you don't shop at Nordstrom's as much as you'd like. Before your interview, walk through their store, section to section and floor to floor, to familiarize yourself with what they carry, how they merchandize, and why they do it the way they do. Walking their store and exploring their products should be part of your preparation for the interview. Then when answering the question, point out some items you noticed when shopping in the store last that have caught your eye. In order to serve their customers well, they are counting on you to see things through their customers' eyes.