a young woman or girl with large breasts who wears tight sweaters
sweater girl in American English
noun
a young woman with a shapely bosom, esp. one who wears tight sweaters
Word origin
[1940–45]This word is first recorded in the period 1940–45. Other words that entered Englishat around the same time include: Rh factor, airlift, black box, update, whiteout