Depends on who is interviewing you. i had a relaxed down to earth person who made me feel relaxed and able to be myself. they want genuine people who will bring customers in, make them feel good, sell them clothes and leave happy.
Be yourself! Be genuine, look at what the people in store are wearing and remember you love helping customers and making people feel good about themselves!
You might not because thousands of people apply. The best way to secure a job is to walk in store and talk to the manager. The personal approach will make you stand out and give you more chances of employment