Richard I, Coeur-de-Lion

(This is listed as a boy's costume, though there's no reason a man couldn't wear it as well.)

The 1887 description:

RICHARD I., COEUR DE LION.  In a maroon velvet tunic trimmed with gold lace, three lions couchant embroidered in gold on the breast; white silk tights; velvet trunks; gold and satin shoes; jewelled belt, sword, and dagger.

The 1880 version differs only in making the lions courant (running) instead of couchant (lying down).  Historically, Richard I appears to have used a device with the three lions passant gardant (striding, facing toward the viewer.)

Sources:
Holt, Ardern.  Fancy Dresses Described, 2nd Edition, Illustrated.  London: Debenham & Freebody, 1880.
Holt, Ardern.  Fancy Dresses Described, 5th Edition.  London: Debenham & Freebody, 1887.