Going to kid cudi concerttt, what to wear?

I'm going july 1st i know thats far away but im really stoked and i just wanna know what you guys think would be a casual outfit to his concert. I'm into all that indy vintage stuff, so any ideas with that would be great. Btw i'm going with 2 guys and 2 girls. One of those boys i like, soooo i wanna look somewhat pretty but not like i tried super hard. Thanks in advance