An "after hood" is a type of sweatshirt that was popularized in the 1930s and 40s. It was created by adding a hood to a crewneck sweater after it was made, rather than manufacturing it as a standalone item. The term "after hood" refers to the fact that the hood was added after the sweater was made. The resulting sweatshirt was functional and provided additional warmth and protection from the elements, making it popular among athletes and warehouse workers. Today, vintage "after hood" sweatshirts are highly sought after by collectors and can fetch high prices.