Flannel is a soft and warm woven fabric that has a napped, or fuzzy, finish on both sides. Typically made of cotton, it may be brushed or unbrushed, depending on its desired softness and end use. Flannel is often woven with patterns, such as plaid or checkered.
Yates, Marypaul, and Adrienne Concra. Textiles for Residential and Commercial Interiors. 2019.