Chaperon

(shăp'er-ŏn) (Synop., § 130), n. [Fr. chaperon, Sp. capiron, It. capperone. See CHAPE, CAPE, and CAP.]

1. A hood or cap. “His head and face covered with a chaperon, out of which there were but two holes to look through.” Howell.
2. A device placed on the foreheads of horses which drew the hearse in pompous funerals.
3. An ornamental or official hood or cap, worn by knights of the Garter, when in full dress. Camden.
4. One who attends a lady in public places as a guide and protector.