jersey
n. countablen. a soft shirt with long sleeves that you wear for sports or to stay warm. It is often made of wool or cotton and pulls over your head.
n. a knitted garment with long sleeves, typically worn over the upper body for warmth or as part of a sports uniform. Often used as a synonym for 'sweater' or 'pullover' in British English.
He wore a warm wool jersey on his hike.
The cyclist pulled on a yellow jersey before the final stage of the race to show he was the leader.
From Middle English Gersey, from Anglo-Norman Gersui, further etymology disputed. Probably from Old Norse [Term?], compound of Geirs (“Geirr's”) + ey (“island”). Also occasionally and historically connected to Latin Caesarea, a common name given to locations conquered by the Romans in honor of Caesar (compare French Césarée). The latter theory still bestows the Latin translation of the island.
Commonly used in British English for a sweater; in American English, it specifically refers to a sports shirt with a player's number.