Girl Wearing A Christmas Sweater

In British English, a sweater is called a jersey, pullover or jumper, the last two terms being the most common name in British English and Australian English. In South African English, a sweater is always called a jersey. Sleeveless pullovers are known in American English and Australian English as vests or sweater vests. In British English they are known as tank tops or slipovers.
A particularly loud, colorful, or decorative sweater has been known in America the past twenty years as a "Cosby Sweater", being named after comedian Bill Cosby's penchant for wearing them during the run of The Cosby Show.