A bovine animal, Bos grunniens, native to the high plateaus and mountains of central Asia. The yak has long, coarse guard hairs over a downy undercoat of fibres. The coarse fibres 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. On a shirt, the yoke is usually on the back across the top shoulder area but can also be on the front shoulder to the chest area. On pants, it is generally on the back of jeans-style pants located below the waistband.