I own way too many band t-shirts and hoodies, but the current favourites are:
Down - Over The Under Europe tour (front is the same as all the others shown on this thread!)
Exodus - Atrocity Exhibition Europe Tour
Overkill - Killfest 2009 backprint - Established 1981 on the front
Gigantour Event shirt
Evile Killer From The Deep shirt (even though it's completely fucked now!)
Gama Bomb - Citizen Brain shirt
Motorhead 30th Anniversary tour hoody
Iron Maiden Killers bootleg Hoody