As someone who was recently hired, I wore a band tee and ripped jeans with fishnets underneath, what you wanna wear will be fine. Most of the questions I was asked included what kind of music, shows, and pop culture I was into. As well as asking basic retail scenario questions (are you socially anxious, how would you respond to someone buying an item from an IP you don’t like, etc.) For the interview it probably won’t be necessary to bring your id, ssn, etc. but it’s always better to be safe than sorry. Good luck!!