Chalmers Knitting Mill was founded in Amsterdam, New York (on the Mohawk River, northwest of Schenectady) in 1901. They used a revolutionary knitting process to manufacture long underwear (which was a ubiquitous article of clothing for men at the time). The patented process was called 'Porosknit,' and it left small holes in material allowing a person’s skin to breathe (union suits up to that point were usually hot and uncomfortable). They later further transformed the underwear market in the 1910s by dividing the union suit into two pieces — top and bottom. (oh happy day!)

The underwear company had an uneven financial history but tended to do well during war years as they manufactured goods for the military. 1917 must have been a flush year as they were able to afford a fancy electric sign in the prime location of Times Square!