This is especially true with luxury brands like Louis Vuitton, Gucci, and Prada. People are either trying to impress others with fakes, or they’ve actually paid full price to become walking billboards.
Similar thing with iPhone cases that have a cutout for the Apple logo. That’s just hilarious.
I definitely consider a band shirt an ad as well, but wearing one feels like a conscious decision to show your preference for that band and perhaps attract like-minded people. With clothing brands, however, it’s more about signaling wealth and status rather than admiration for the brand itself. You’re wearing an ad and being oblivious to it.