The dress code is business casual, try to wear clothes that is similar to the trend, as most costumer based their purchase on what the employee is wearing. Banana Republic do not require you to wear their items, however, its beneficial when trying to sell to the costumers.
I had a fairly quick and simple hiring process. I had found them through a job fair, and within a week I was called to a group interview. After the interview I was called back within the next week and asked to start shortly after that!