tabard

noun
  1. 1

    A silk banner attached to a bugle or trumpet.

  2. 2

    A woman's or girl's sleeveless jerkin or loose overgarment.

  3. 3

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

  4. 4

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

  5. 5

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

Source: https://en.wiktionary.org/wiki/tabard