Item: Filson Vintage Flannel Work Shirt. Our Vintage Flannel Work Shirt is made with a breathable midweight cotton and has a soft brushed interior. The pleated back provides a full range of motion through the shoulders. Button-down front with button-adjustable cuffs.Pleated back for ease of movement in shoulders. Shirt is durable, soft and machine washable. Brushed twill interior offers wind-resistant comfort. Double-needle construction and flat felled seams add durability.