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.
A sports jersey is a shirt worn by a member of a team that identifies his affiliation with the team. A jersey identifies the athlete’s name and/or number, generally showing the colors and logo of the team. A jersey may also include the logo of the team’s sponsor.