gussets

A gusset is a triangular, wedge-shaped, or diamond-shaped piece of material inserted into a seam, joint, or enclosure to provide extra breadth, strength, or both. The concept is used across textiles, leather goods, upholstery, and structural engineering to improve fit, durability, or capacity.

In clothing and textiles, gussets are used to accommodate movement, add width, or shape a garment. Common forms include triangular underarm gussets in shirts and dresses, and crotch or inseam gussets in trousers and bodices. Gussets can be cut from the same fabric or from a contrasting material for decorative effect, and may be stitched in as a separate panel or integrated into the seam.

In bags, luggage, and upholstery, gussets create additional volume or depth. A bottom gusset expands a tote or suitcase, while side or top gussets increase side capacity or adjust profile. In upholstery, gussets can be used in cushions and covers to allow for fuller, more comfortable shapes.

In structural and mechanical contexts, a gusset is a reinforcing plate or bracket used to strengthen joints where members meet. Gusset plates, typically triangular or rectangular, are welded or bolted to connect beams, columns, or other structural members in trusses and frames. Design considerations include thickness, bolt pattern, and welding quality, all aimed at improving load transfer and joint stiffness.

Overall, gussets serve to enhance fit, capacity, or strength by adding a carefully shaped panel at a point of stress or expansion.