What to wear to an MGMT concert in Nov?

So I'm going to the MGMT concert in Raleigh, NC on Wed. but I have no idea what to wear. It's going to be pretty chilly outside, but the concert is inside so I imagine it'll be hot. I'm really open to any suggestions here, since I have a pretty expansive wardrobe. I'm a girl, and it's a first date as well with a guy I've known for a long time, so I want to fit in with the other concert-goers but still stand out, if that makes sense.