Double Duty

Blouses like this black and white one (only $17!) that can do double duty as work and weekend wear are closet must-haves for me. I wear them constantly and thus am always on the lookout for pieces like them. I have them in all forms: long sleeve, short sleeve, and tank tops. I pair them with skirts, trousers, skinny jeans, and shorts. I layer them with blazers, under sweaters, and wear them alone. I love ones like this that are basic (white) but have fun detail like this black piping, because the milage I can get out of them is even greater. What are your double duty wardrobe pieces? I just snagged these distressed  black boyfriend shorts from Gap on a recent sale,...