An oversized sweater is a piece of clothing that is much larger than it should be, typically designed to fit loosely over other clothes. It can refer to any type of sweater or knitwear garment that has been made in an extra-large size, often intentionally for a relaxed and casual look. The term "oversized" is used because the sweater does not conform to standard sizing conventions but instead is designed to be worn baggy and loose fitting.