Nordstrom advertises that they are looking for candidates who "seek fashion and product knowledge to build expertise," who have "excellent communication and people skills," and who are "obsessed with serving our customers and oh, of course, fashion." So whether you work in retail or in product development, your interviewer is curious how passionate you are about pursuing a career in their industry, and how you would communicate your passion to their customers. So answer this question by talking about fashion with your interviewer, conveying your enthusiasm and passion for the subject. Communicate in a fashion that would assure them you'd represent their company according to their values and culture.