Dress for yourself, not the crowd. I wore this vintage 70s pink floaty cape with pearl appliqués for the Charli XCX Crash tour and despite food poisoning I still had a blast. I wore my huge clown sweater to see Bar Italia and was the most colorful person in the crowd but felt very much myself. For JPEG/Danny Brown I wore my sonic shirt and mary jane’s and got a lot of compliments on my shoes and was not tempted to go into the mosh pit which worked in my favor. Sometimes I tone it down with colors for smaller local shows, last pic is one of my favorite jumpers that has a ton of pockets so it’s great for concerts.
Just be comfortable and feel comfortable and you will be immune to wondering if others around you think you’re cool. My husband and I are going to bladee in october and will no doubt be surrounded by teenagers so I may just bust out the pantsuit for that show.