The phrase "oversized jumper" refers to a loose and large sweater or pullover that is intentionally made to be bigger than the usual size, providing a comfortable and relaxed fit. Full definition
Knit dresses with tights, denim sets and leggings teamed up with oversized jumpers. (glossyu.com)
I love the Fall season because you can wear oversized jumpers and still get a way with shorts. (violettedaily.com)
From oversized jumper dresses to intricate ruched designs and bang on trend knitted jumper in a bardot style, you are sure to find a style that fits you. (prettylittlething.com)