What is a piece of plate armor covering the same parts and worn over the buff coat in the 17th century, and without other steel armor. Unfix the gorget's iron clasp. Sir W. Scott called?

gorget — A piece of plate armor covering the same parts and worn over the buff coat in the 17th century, and without other steel armor. Unfix the gorget's iron clasp. Sir W. Scott. (Webster's 1913.)