band shirt
A shirt or other form of topwear that is made by a record label or merch company that supports a band or musical artist, often brought by fans at live events or from online storefronts.
Use this tag for real band shirts, fictional merch for fictional bands, as well as "generic genre design" shirts such as a dark color t-shirt with scratchy hard-to-read writing being a "generic metal design." For real merch be sure to tag the band as well.