Flannel has been made since the 17th century and likely originated in Wales. Though it was once made of wool, by the 20th century, flannel was more commonly made with cotton, sometimes mixed with silk. Nowadays, the softest, coziest flannel is 100% cotton.

Flannel shirts are synonymous with hard workers who go directly to the field. Used by people who are on the front line and in direct contact with the object of work in the field.