Answer: gussets

AnswerCrossword Clue
GUSSETSTailoring inserts
GUSSETSTailor's inserts
GUSSETSClothing inserts.
GUSSETSTailors' inserts
gussetsA bracket strengthening an angle of a structure
gussetsA piece of material sewn into a garment to strengthen or enlarge a part of it, such as the collar of a shirt or the crotch of an undergarment