It should be from the Nara era that Chinese clothes were introduced into Japan and institutionalized. In the 8th century A.D., China's Tang Dynasty costumes were introduced to Japan, which had an impact on kimonos originating in Japan. At that time, there were many names of kimonos, such as "headdress", "flag" and later "kimono", all of which were influenced by East Asian costumes. The Japanese Nara era coincided with the prosperous Tang Dynasty in China. Japanese sent a large number of scholars and monks to China to study, exchange and absorb. These envoys brought the culture, art and laws of the Tang Dynasty back to Japan. The "clothing order" is one of the systems formulated in the Nara era. The Dress Order stipulates formal dress, court dress and uniform-court dress includes crown hat, which is distinguished according to official rank; Uniforms are the clothes of civil servants without official positions, which are classified by industry. Generally speaking, the color of clothing in Nara era is relatively simple.