Definition of "cotehardie"
(historical) A mid to late 14th century unisex garment tailored to fit the torso and arms, usually with a row of buttons down the front as well as down each fitted sleeve from the elbow to the wrist. Women's coathardies trailed on the floor, but those for men could be cut very short.
Quotations
The old tunic, overtunic and cyclas were too sad and simple for the new fashions, so now strange and brilliant cotehardies, pourpoints, courtepies, paltocks, hanselines and many other wondrous garments, particoloured or diapered, with looped, embroidered or escalloped edges, flamed and glittered round the King.
1905-06, Arthur Conan Doyle, Sir Nigel