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plural surcoats
(historical) A loose garment without sleeves worn over a suit of armor, sometimes colored or embroidered with the wearer's coat of arms. quotations
The Lord mayor and sheriff ride in their armour with surcoats of crimson.
2020, Hilary Mantel, The Mirror and the Light, Fourth Estate, page 165
(historical) An overgarment worn over a woman's gown; a kind of short robe worn over the tunic at the close of the 11th century.