gusset

A reinforcing piece of fabric sewn into a garment is called a gusset. Manufacturers use metal gussets to reinforce joists or join metal plates together.

Most gussets are shaped like triangles. Some gussets make clothing sturdier, and some make it wider or shape it more accurately to the body. They might be added along the sides of a shirt, under the arms, or at the spot where inside leg seams meet in a pair of pants or tights. The original gussets were used in chain mail or armor, to cover unprotected areas. The word comes from the Old French gosset, "armhole," or "piece of armor for the armpit."

Definitions of gusset
1

n a piece of material used to strengthen or enlarge a garment

Synonyms:
inset
Type of:
piece of cloth, piece of material
a separate part consisting of fabric

n a piece of chain mail covering a place unprotected by armor plate

Synonyms:
voider
Type of:
chain armor, chain armour, chain mail, mail, ring armor, ring armour, ring mail
(Middle Ages) flexible armor made of interlinked metal rings

n a metal plate used to strengthen a joist

Synonyms:
gusset plate
Type of:
brace, bracing
a structural member used to stiffen a framework
plate
a sheet of metal or wood or glass or plastic

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