A jersey is an item of knitted clothing, traditionally in wool or cotton, with sleeves, worn as a pullover, as it does not open at the front, unlike a cardigan. It is usually close-fitting and machine knitted in contrast to a guernsey that is more often hand knit with a thicker yarn. The word is usually used interchangeably with sweater. 
The shirts now commonly worn by sports teams as part of the team uniform are also referred to as jerseys, although they bear little resemblance to the original hand-kitted woolen garments.
A jersey as used in sports is a shirt worn by a member of a team, typically depicting the athlete's name and team number as well as the logotype of the team or corporate sponsor. Cycling jerseys of specific color or pattern represent certain statuses in cycling, such as the yellow jersey of the leader of the general classification in the Tour de France, or the rainbow jersey for the world champion. Cycling jerseys are usually made of synthetic microfiber material to aid in wicking sweat away from the skin to allow it to evaporate. The main garment of an ice hockey uniform, which was traditionally called a sweater, is increasingly known as a hockey jersey. This garment, along with basketball jerseys which are usually sleeveless and baseball jerseys which are usually button up, have become fashion accessories. A related term is " bib", which may refer to a shirt (jersey, esp. in Britain[ citation needed]). In Australian rules football, the player's shirt is known as a " guernsey". 
In some sports, such as ice hockey, baseball, basketball, and various football codes, a player's jersey may be " retired". When a jersey is retired, that player's jersey is placed usually where the team plays in honor of that player's accomplishment. Generally, when a jersey is retired, the number on the player's jersey is made unavailable for future players. 
- Kane, C.D.; Patil, U.J.; Sudhakar, P. (1 August 2007). "Studies on the Influence of Knit Structure and Stitch Length on Ring and Compact Yarn Single Jersey Fabric Properties". Textile Research Journal. 77 (8): 572–582. doi: 10.1177/0040517507078023.
- Shinn, W.E. (1 March 1955). "An Engineering Approach to Jersey Fabric Construction". Textile Research Journal. 25 (3): 270–277. doi: 10.1177/004051755502500314.
- Shishoo, Roshan (29 August 2005). Textiles in Sport. Elsevier. ISBN 9781845690885 – via Google Books.
- Media related to Jerseys at Wikimedia Commons