(1):

(n.) A kind of knitted jacket; hence, in general, a closefitting jacket or upper garment made of an elastic fabric (as stockinet).

(2):

(n.) The finest of wool separated from the rest; combed wool; also, fine yarn of wool.

(3):

(n.) One of a breed of cattle in the Island of Jersey. Jerseys are noted for the richness of their milk.