Linings are materials used to cover the inner surfaces of garments, bags, or other items. They serve various purposes, including providing comfort, enhancing appearance, and adding warmth. Common lining materials include cotton, polyester, and silk, which can improve the durability and feel of the outer fabric. In clothing, linings can also help garments maintain their shape and prevent wear. For example, a jacket may have a polyester lining to make it easier to put on and take off. Additionally, linings can be used in bags to protect the contents and add a touch of style.