In Dead Rising 2 for the PS3, Xbox 360, and PC, there are several different outfits you can unlock that will appear in the closet of the safe house.
Bowling Shirt – Import a Dead Rising 2: Case Zero file
Champions Jacket – Win a TIR episode
Convicts Clothes – Kill ten psychopaths
Hockey Mask – Use every melee weapon in the game to kill a zombie
Hunting Jacket – Import a Dead Rising 2: Case Zero file
Overalls – Import a Dead Rising 2: Case Zero file
Tattered Clothes (aka Shaun of the Dead outfit) – Kill 1,000 zombies with your bare hands
TIR Helmet – Win $1,000,000 in TIR Online
TIR Outfit – Win $5,000,000 in TIR Online
Waitress Outfit – Import a Dead Rising 2: Case Zero file
Willemette Mall Outfit – Rescue fifty survivors