jupon

plural jupons · alternative juppon

1. historicalA close-fitting sleeveless jacket, descending below the hips, worn over armour.

   He climbed three marble steps, crossed the terrace and entered a dim foyer, where a chamberlain silently helped him from his helmet, his jupon and his chain cuirass.

   1983, Jack Vance, chapter 26, in Lyonesse

   1 more example

   Some wore coat armour, imitating scale, And next their skins were stubborn shirts of mail; Some wore a breastplate and a light juppon, Their horses clothed with rich caparison;

   1700, John Dryden, Palamon and Arcite, Book III

2. A petticoat.