What is the meaning of Tabard?

A silk banner attached to a bugle or trumpet.

A sleeveless jerkin or loose overgarment.

A sleeveless garment made of coarse cloth formerly worn outdoors by the common people.

A cape or tunic worn by a knight, emblazoned with the coat of arms of his king or queen on the front.

A similar garment officially worn by a herald and emblazoned with his sovereign's coat of arms.

tabard

pea coat

tabard

Source: wiktionary.org