The next time you are bored in a public place, play the "T-shirt game"

I’m curious to get a ruling on a pop star (I’ll leave them unnamed) wearing their own t-shirt at their own gig. It was just the rehearsal run through (they were of course much dressier in the concert) but still I thought it was pretty tacky but have no idea if this is common or not. Like, I get that a certain amount of self-promotion in show-biz is normal-if-annoying but really how egotistical does one have to be.