Wool sweater originally refers to knitted sweaters made of wool, which is also the meaning recognized by ordinary people. In fact, "wool sweater" has become synonymous with a class of products, that is, it is used to refer to "knitted sweater" or "Wool Knitwear". Wool knitwear refers to fabrics woven from wool, cashmere, rabbit hair and other animal hair fibers as main raw materials, such as rabbit sweaters, snow blue sweaters, sheep sweaters, acrylic sweaters, etc. It is a big family of "wool sweaters".