gousset

• gusset

Borrowed from French gousset.

gousset (plural goussets)

1. A small piece of mail, providing some protection where two plates of armor are joined, usually at the elbows, under the shoulders, and behind the knees.
   • 1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 22:

     At the joint, or bending of the arm, the vambraces were cut obliquely, the vacancies on the inside, when the arms were streightened, were covered by pieces of mail callet [sic] Goussets, and afterwards by a contrivance of plates resembling hearts.

• Wikipedia article on armor.

• outsegs

From Old French gosset, gousset (“the hollow of the armpit”), diminutive of gose, gosse (“bean pod, hull, husk”). By surface analysis, gousse +‎ -et.

• IPA^(key): /ɡu.sɛ/

gousset m (plural goussets)

1. gusset

• → English: gousset

• “gousset”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.