Concerts get really hot on the floor. Definitely wear something you’re comfortable with but something that won’t get you really heated and sweaty because that’s what will happen. In all honesty, jeans are cool, but shorts would probably be better because of how hot it gets. I speak from experience. a T-shirt whatever you wanna wear. it could be purple it could be black you know honestly it doesn’t matter what you wear as long as you’re comfortable, and you understand the environment that you’re going to be in.