What is gusset definition?

A gusset is a triangular or rectangular piece of fabric or other material used to strengthen or reinforce a particular item or structure. They are commonly used in clothing, bags, tents, and other items that experience stress or require additional support. Gussets can be made from a variety of materials including canvas, leather, nylon, and polyester. They are generally sewn or glued in place and may be flat or pleated to allow for greater flexibility and movement. The term "gusset" may also refer to the seam or joint where the gusset is attached to the main fabric.