Girl Wearing A Christmas Sweater

A sweater, jumper, pullover, sweatshirt, jersey or guernsey is a garment intended to cover the torso and arms. They are often worn over a shirt, blouse, T-shirt, or other top, or as for women, worn alone with only a bra underneath. Sweaters tend to be, and in earlier times always were, made from wool; however, they can be made of cotton, synthetic fibers, or some combination thereof. Sweaters are maintained by washing, and the use of a lint roller.
Types and design
The term "sweater" is a catch-all for various types of garments. A fundamental division is between a cardigan (which opens in front) and a pullover (which does not). If the sweater has no sleeves, it is generally called a sweater vest or tank top; a "vest" in British English refers to the same item as "undershirt" in American English.