The earliest is hand-knitted sweater, which should be made by shepherds of ancient nomadic tribes. In ancient times, people's initial clothes were hides and leaves, and then they gradually developed and textiles appeared. In China, the raw materials of textiles are silk and hemp, which can be said that nobles wear silk and bitches wear hemp; In the nomadic areas of Central Asia, the raw material of textiles is wool, mainly wool. Cotton, another important preventive raw material, originated in Central and South America. It became popular in the world after Columbus discovered the New World, and did not enter China until the end of the Ming Dynasty. Whether it is silk, hemp or wool fabric, it is interwoven with warp and weft. Hand knitting and knitting are two completely different technologies. Compared with making silk and other clothes, hand-knitted sweaters have great flexibility. Silk and other clothes need three processes from raw materials to ready-made clothes: spinning, weaving and sewing; Hand-knitted sweaters need two processes: spinning and knitting. When knitting, besides wool, only a few thin bamboo needles are needed. If woven products are more suitable for mass production, then weaving is more suitable for individual labor.
Every spring season, all kinds of animals begin to shed their hair, take off their short hair in winter and put on long hair adapted to hot summer. The shepherd collects the fallen wool, washes it and dries it. When grazing, the shepherd sits on a stone and watches the sheep eat grass, making wool into thin strips. These thin strips can be used to weave blankets and felts, and then they can be spun into woolen cloth. One day, the north wind blew tighter and tighter, and the weather became colder and colder. A shepherd, perhaps a slave, has no clothes made of felt to keep out the cold. He found some branches and tried to wrap the wool in his hand into pieces that could be wrapped around him to keep out the cold. He finally got the hang of it, so he got a sweater later.