Chainstitch is a type of stitching used in sewing, particularly in the context of denim garments like jeans. It is characterized by a distinctive chain-like appearance created by interlocking loops of thread. In chainstitching, the needle passes through the fabric, creating a loop of thread on the underside. As the needle is pulled through the fabric, the loop is interlocked with the previous stitch, forming a chain-like pattern on the fabric's surface. Chainstitching can be done using a regular sewing machine or a specialized chainstitch machine. In the case of denim jeans, chainstitching is often used for hemming the bottom edge of the jeans, creating a unique roping effect at the hem.