A robe is a loose-fitting outer garment. A robe is distinguished from a cape or cloak by the fact that it usually has sleeves. The English word robe derives from Middle English robe (“garment”), borrowed from Old French robe (“booty, spoils”), itself taken from the Frankish word *rouba (“spoils, things stolen, clothes”), and is related to the word rob. FROM WIKIPEDIA
SO THIS IS WHY SO MANY HOUSE COATS ARE TAKEN FROM HOTELS!