Belt, the leather belt in the Han Dynasty was equipped with luxurious hooks, but there was no certain system. Leather belts in the Tang Dynasty were tied with buckles instead of hooks, and belts were tied on them. The belt is a square decorative piece, which is made of jade, gold, rhinoceros, silver, copper, iron and other materials according to different official ranks, making the belt a symbol to distinguish official ranks. In addition, the system of "color-tasting clothes" appeared in the Sui Dynasty, which was formed in the Tang Dynasty and became a major feature of the official clothes system in China.