Surcoat

Part of speech: noun (n.)

1. A coat worn over the other garments; especially, the long and flowing garment of knights, worn over the armor, and frequently emblazoned with the arms of the wearer. A long surcoat of pers upon he had.. Chaucer. At night, or in the rain, He dons a surcoat which he doffs at morn. Emerson.

2. A name given to the outer garment of either sex at different epochs of the Middle Ages.