55: Temperature, in degrees Fahrenheit, in Welsh mines. The crisp working conditions inspired flannel shirts, according to one story.

1860: Year one of the first references to flannel appeared in a book

1939: Year that Cedar Springs, Mich., started its annual Red Flannel Day, which is still going

89: Number of flannel products sold by L.L. Bean

Sources: Landsend.com, canadianconnection.com, www.cedar-springs.mi.us, llbean.com