Firstly you will have an ice breaker where you tell everyone who you are, hobbies,education etc.
Then you will most probably have a 1-2-1 interview, i got asked things like:
Why are you wearing what you are wearing?
Give an example of a time where you have helped someone that was not compulsory, how did it make you feel?
When have you been given positive feedback, how did it make you feel?
How would you handle a costumer complaint?
When have you worked under pressure, how did you handle it?
How would your previous employer/friends describe you?
There is a lot of questions so come up with some examples before you go in, they are mostly customer related, so make sure you get the message across that you love fashion and strive to give exceptional customer service.