Is it tacky to wear merch promoting the band you are seeing?

I had a dream the other night where I was at a Finntroll concert and I was talking to the vocalist. He was upset because I was wearing a Drive-By Trucker's jacket to one of his shows and he was confused because he thought maybe I was there to see DBT. And then it turned out we were wizards or something and everything might have looked like a Lisa Frank picture before I woke up and was confused. I don't really remember much about the end of the dream besides the wizard part and something really colorful.

I can't believe it took a little over a week for my brain to put the title question into a dream. Though I did get a high-five from some random guy at the Drive-By Trucker's show for wearing their jacket. The guy looked like a viking and had a cool beard. The end.