You will come across clothing items more often than you realize. Don't you know that the Dead Rising franchise was founded on screwed up, funny clothing combos? You'll see shoes, hats, costumes, pants, skirts, go-go boots, etc. Just pick everything up that you come across and make Nick look as silly as possible. If you really hate it, just equip the same garment again to revert to what you were wearing originally. This should come without much grinding.