Sweater clothing is commonly known as sweater clothing, also known as wool knitwear, which is a knit garment woven from wool yarn or wool-like synthetic yarn. Hand-knitted knitwear appeared in the Euphrates and Tigris river basins around 1000 BC. Machine wool knitwear appeared in modern times. In 1862, American RIW Ram invented the double-reverse flat knitting machine, which produced sweaters on it for sewing into garments, marking the beginning of the machine knitting wool knitwear. . With the improvement of people's living standards, people in the clothing are more demanding light and soft, elastic, extensible and drape, good breathability, and fashionable, bright color clothing. Since these demands are the superiority of sweater clothing, the sweater clothing plays an increasingly important role in the entire clothing field. Sweaters are developing in the direction of outerwear, serialization, fashion, art, high-end, and branding.