What is the X in X-mas?
1580s as a type of knitted cloth; 1842 as a breed of cattle; both from Jersey, one of the Channel Islands. Its name is said to be a corruption of Latin Caesarea, the Roman name for the island (or another near it), influenced by Old English ey "island;" but perhaps rather a Viking name (perhaps meaning "Geirr's island"). The meaning "woolen knitted close-fitting tunic," especially one worn during sporting events, is from 1836.
chief town, resort, parish, and the capital of Jersey, in the Channel Islands. The town lies along St. Aubin's Bay opposite a tidal island known as L'Islet (accessible by causeway at low tide), on the south side of Jersey Island. The town is named for St. Helier, a Frankish missionary who was reputedly martyred there in 555. The saint's memory is preserved in the Hermitage, a small 12th-century oratory on L'Islet, as well as in the Abbey (later Priory) of St. Helier, founded in the mid-12th century by Robert FitzHamon, of Gloucester
outer garment, usually knitted or crocheted, that is worn on the upper part of the body, either pulled over the head or buttoned down the front or back. Although hand knitting of wool had been practiced for about 2,000 years, it was not until the 15th century that the first knitted shirts or tunics were produced on the English Channel islands of Guernsey and Jersey; hence the English name jersey. The knitted garments were made by the wives of fishermen and sailors from natural wool, which, by retaining its oil, protected against the cold even when damp. The use of the jersey spread throughout Europe, especially among workingmen. In the 1890s it was adopted by athletes in the United States and called a sweater.