Fabric inserts, also known as gussets, are pieces of fabric that are inserted into a garment or other item to provide extra strength and support. They are commonly used in the construction of clothing, bags, and other items to reinforce seams and add structure. Gussets are usually made from a strong, durable material such as canvas, denim, or leather. They can also be made from a variety of fabrics, including cotton, polyester, and nylon. Gussets are an essential part of many garments and accessories, providing extra strength and support while also adding a decorative touch.