A flannel shirt is a type of shirt made from flannel fabric, which is a soft, woven material typically made from cotton or wool. Flannel is known for its warmth and comfort, making it a popular choice for casual wear. Flannel shirts often feature a plaid or checkered pattern, although they can also come in solid colors. These shirts are versatile and can be worn in various settings, from outdoor activities to casual gatherings. They are often associated with outdoor enthusiasts and grunge fashion, reflecting a laid-back style. Flannel shirts are commonly layered over t-shirts or worn alone for a cozy look.