A sweater is knitted from yarn, usually wool, cotton, cashmere, or synthetic fibers. A sweatshirt is sewn from fleece or cotton jersey, often with a soft fleece interior.
The easiest distinction is construction: sweaters are knit; sweatshirts are cut and stitched from fabric. Sweaters can move between casual and business-casual outfits, while sweatshirts stay closer to athletic and lounge wear.
| Sweater | Sweatshirt | |
|---|---|---|
| Construction | Knitted | Stitched (woven or jersey fabric) |
| Common materials | Wool, cotton, cashmere, synthetics | Fleece, cotton-jersey, cotton-poly blend |
| Interior | Varies by material | Usually soft fleece lining |
| Formality | Casual to business casual | Casual and athletic |
| Common styles | Cardigan, turtleneck, V-neck, crewneck, cable-knit | Crewneck, hoodie, zip-up |
| British English term | Jumper | Sweatshirt |
Sweater
A sweater starts with construction. Yarn loops interlock through knitting, giving the garment texture and stretch. That structure traps warmth while allowing some airflow, so a sweater can be warm without feeling bulky.
Materials vary widely. Wool, including merino and lambswool, is warm and moisture-wicking. Cashmere is softer and lighter; cotton suits mild weather; synthetic blends add durability and help the garment hold its shape.
Common styles include cardigans, turtlenecks, crewnecks, V-necks, and cable knits. A sweater can dress up with trousers or a blazer, or stay casual with jeans.
In British and Australian English, sweaters are called jumpers. The terms pullover and jumper refer to the same garment type and are used interchangeably in the UK.
Sweatshirt
Sweatshirts began as 1920s athletic wear for keeping athletes warm during training. In the 1930s, Champion made sweatshirts for university athletic teams, helping move them into everyday casual wear. In the 1950s, screen printing put team names and logos on them, tying sweatshirts closely to school and sports culture.
Sweatshirts are made from stitched fabric, usually cotton jersey or a cotton-poly blend, with soft fleece inside to trap warmth. The outside is smooth rather than textured like a knit sweater.
The main styles are crewneck, hoodie, and zip-up. Because of their athletic roots, sweatshirts fit casual wear, exercise, and lounging; they usually do not work for business casual or formal outfits.
Which to choose
Choose based on occasion and feel. Sweaters offer more range because they dress up or down and come in materials for different temperatures. Sweatshirts prioritize warmth and comfort in casual settings.
Both can have crewnecks, so texture is the clearest clue: knit texture means sweater; smooth outside plus fleece lining means sweatshirt.
