Flannel is a soft, woven fabric that is typically made from cotton, wool, or synthetic fibers. It is known for its warmth and comfort, making it a popular choice for clothing like shirts, pajamas, and blankets. Flannel can be brushed on one or both sides to create a fuzzy texture, enhancing its coziness. Originally, flannel was used in Wales for making shirts and undergarments. Today, it is often associated with plaid patterns, which are commonly seen in casual wear. Flannel is especially popular in colder climates, as it provides insulation and is breathable, making it suitable for layering.