About 1925 the word sweatshirt came into the vocabulary. Sweatshirts in were originally for athletes to wear while warming up, before or after sports. The earliest sweatshirts were utilitarian gray pullovers.
Brothers, Abe and Bill Feinbloom, founded the Knickerbocker Knitting Company, now Champion Products in 1919. It was a sweater mill, but in the mid 1930’s they patented a flocking process to put raised letters on clothing and began manufacturing athletic wear. They first made sweatshirts but soon added a "sideline sweatshirt" with football players as the market. It was a zipper front hooded sweatshirt.
The boom of wearing university names on sweats started in the1960’s and is still going strong.
By the 70’s the t-shirt slogan craze began to show up on sweatshirts.
Jog suit (or tracksuit), is a sweatsuit of matching pants and jacket, both fleece lined, worn for jogging in the 1970’s
In the late 1970’s a ladies designer Norma Kamali started using sweatshirt material for women’s fashion jackets, skirts, and pants, and made athletic fabric trendy.