Other forms: sweatshirts
A sweatshirt is a thick cotton top with long sleeves and no collar. Pulled on over your head, and worn everywhere now.
It began as sportswear, made from a heavy looped-back cotton that soaks up sweat, which is exactly where the name comes from. A hooded one is a hoodie and a zipped one is a zip-up. It has travelled from the gym to the office over about fifty years. Sweatpants and a sweatshirt together make a tracksuit, which Britain has been calling a trackie for decades.
1nounsweatshirtA loose thick cotton top with long sleeves.
“He pulled a sweatshirt on over his T-shirt.”
From sweat + shirt.
Etymology from Wiktionary, CC BY-SA