Fiber in clothing refers to the thin, long, flexible, and hair or thread-like structures that are used to make fabrics. Fibers can be natural or manufactured, and they are the basic unit of most fabrics. Natural fibers are obtained from plants and animals, while manufactured fibers are made from chemical substances. Examples of natural fibers include cotton, wool, and silk, while examples of manufactured fibers include nylon and rayon. The characteristics of a fabric depend on the type of fiber used and the treatment applied to it. Understanding fibers and their performance is essential for fashion designers because fibers influence the end product clothing aesthetics, durability, comfort, appearance, retention, and care.