Anyone who has seen a kimono will notice that the back of a female kimono is very heavy and has a very protruding part, similar to a backpack. In fact, it is a knot on the belt, which gradually evolved. At that time, the Japanese were very interested in seeing a rope-like belt tied to the missionary's robe and imitated it one after another. At first, it was just a rope-like belt wrapped around the body. It was not until the Edo period that the belt tied to the kimono was changed to a wide belt. At first, it was only three or four centimeters wide, and then it was gradually widened and became the kind of wide belt later. But too wide a belt will make the whole person's figure become a cylinder as thick as the top and bottom. In order to avoid this ugly effect, smart women came up with a way to tie a knot on the belt and try to make the knot close to the chest, thus strengthening the curve of the figure. At first, the knot of kimono belt was tied in the front, and the knot was very small. However, in order to attract attention, the knot is getting bigger and bigger, and as a result, it is very inconvenient for people wearing kimonos to walk. In the early Edo period, Japanese women carried out clothing transformation in Cui Yu, moved the knot of the belt to the back and decorated it with famous exquisite ornaments.