Midnight Mannequin Massacre

You got invited last second to a totally rad Halloween party, but there's a costume requirement and you don't have anything ready. You live in a small town, and it's late. There aren't any stores open nearby, but there is that one Halloween store in the town open. You drive there, to find the store dark, but the doors are open. You figure you'll just borrow some costume pieces real quick and retur…