Flannel coats made of flannel fabric are one of the most common types of coats and are suitable for the general public. Flannel fabric is called "flannel" because all the hair on the surface of the coat is in one direction. The surface of the fabric is treated with brushing and shearing to make it look more high-end. However, flannel coats are generally not made of pure wool, but may contain 5% to 15% nylon or other materials.