I have some crappy shirts that I either haven't seen in many years or that people have bought me, such as Metallica (4-5), Iced Earth (1) and Opeth (1) shirts. Then I have:
Bathory - Bathory
Blind Guardian - Tales From The Twilight World
Burzum - Det Some Engang Var
Celtic Frost - Morbid Tales
Destruction - Mad Butcher
Exodus - Bonded By Blood
Goat Horn - Storming The Gates
Judas Priest - Sad Wings Of Destiny
Judas Priest - Halford on a motorcycle
Mayhem - Pure Norwegian Black Metal
Mercyful Fate - 9
Venom - Welcome To Hell
Others I can't think of.