cardigan (n.)

"close-fitting knitted woolen jacket or waistcoat," 1868, from James Thomas Brudenell (1797-1868), 7th Earl of Cardigan, English general distinguished in the Crimean War, who set the style, in one account supposedly wearing such a jacket while leading the Charge of the Light Brigade at Balaclava (1854). The place name is an Englishing of Welsh Ceredigion, literally "Ceredig's land." Ceredig lived in the 5th century.