goussets

Noun

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.
   • 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.1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 22