A bovine animal, Bos grunniens, native to the high plateaus and mountains of central Asia. The yak is covered the long, coarse guard hairs over a downy undercoat of fibers. The coarse fibers are used locally for carpets, blankets, sweaters, and outerwear. The fine down is similar to cashmere and is used for cloth and yarn.

The entire back of a garment is one piece and has a single yoke superimposed on the outside.

The front and backs of a shirt are joined without a yoke facing.