means A long, loose flowing garment worn over the body, used for comfort, ceremony, or to mark office.

from From Old French 'robe,' which oddly meant 'booty' or 'plunder' before it meant clothing — itself from a Germanic root tied to 'rob' and stealing (a cousin of English 'rob' and German 'rauben'). The link makes grim sense: in early medieval Europe, the clothes off a defeated enemy's back were among the spoils of war, so 'robe' traveled from 'stuff seized' to 'fine garments seized' to simply 'a garment.' The thief and the bathrobe share a bloodline.