It is known that during the Tran dynasty (1225-1400), wealthy men and women wore a black silk dress with a fine silk collar and wide-legged pants. Underneath they wore a white dress. The women's white dress would be longer than the men's. The emperor forbade the wearing of the colors green, red, scarlet, and yellow. In 1407, during the Ming Occupation, the Chinese forced the Vietnamese to assimilate to their culture by adopting a short jacket and pants. Subsequent Vietnamese rulers also forced their subjects to dress like the Chinese, thinking it more refined and practical. Over the next few centuries, Vietnamese common dress was subject to the whims and esthetics of the present emperor. Sometimes the laws were contradictory. For example, during the fifth year of the Le dynasty (1665), Emperor Huyen Tong outlawed the wearing of tunics belted at the waist with pants. Then in 1837, women were prohibited from wearing skirts by the royal decree of Emperor Ming Mang. He did not think skirts were beautiful, so his female subjects were obliged to return to wearing pants. During the reign of Emperor Tu Duc, official dress was sanctioned by laws. There was an exact system of dress according to rank. They wore long tunic robes with large sleeves, wide belt, pants, high boots, and winged courier hats. The color of the robes, as well as the variations on the embroidery and brocade fabric indicated the rank and importance of the wearer. Gold brocade with embroidered dragons was reserved for the emperor Madarins of high rank wore purple, while lower-ranking mandarins wore blue.