The clothing worn by merchants, squatters, coachmen, hunters, sailors, etc. in ancient China has the characteristics of professional clothing. In the fifteenth to sixteenth centuries, sailing suits appeared in Spain, Portugal, the United Kingdom, and the Netherlands, where the maritime industry was developed. In Europe and the United States, railway clothing, postal services, miners' clothes, and steel-making uniforms appeared. Subsequently, diving suits, fire suits, mountaineering suits, polar suits, etc. appeared one after another. After the Second World War, there were cosmic suits and radiation suits. Chinese professional clothing appeared after the Opium War in 1840. In the banking, hospital, railway, mining, customs, postal, processing and manufacturing industries that were opened or managed by foreigners at that time, practitioners were required to wear professional uniforms. For example, in the postal industry, when the British were managed in 1897, the postal service summer clothes were blue, and the winter clothes were blue-gray. When the French were managed in 1905, the postal service was green. The Qing government also stipulated that some employees of government-run enterprises wear professional uniforms. After the founding of the People's Republic of China, China promulgated vocational services in the post, telecommunications, railway, customs, shipping, medical and other industries; since 1979, it has issued civil aviation uniforms, ocean-going outerwear, petroleum workers' uniforms, mine tunnel suits, road maintenance uniforms, and tax services. , traffic supervision services, business management services, etc. China's current professional clothing, with reference to foreign professional clothing styles, combined with the country's original professional service and the characteristics of various industry operations design and production, the formation of professional clothing with Chinese characteristics. For example, the postal service uniform is dark green; the in-service personnel are dressed in suits, wearing light brown ties; the field personnel are dressed in safari, wearing a large hat and embellished with a postal and telecommunications emblem; the button also has a postal and telecommunications sign. Another example is the railway suit, based on the suit style, divided into spring and autumn clothes, winter clothes, summer clothes and three kinds. The spring and autumn clothes are blue-gray, the winter clothes are dark blue, the summer clothes are navy blue; the tie is jujube red and purple; the female summer dress is a skirt; the big hat is decorated with a cap badge, the cap badge is supported by gears and wheat ears, and the middle is the road. The emblem and the button also have a road emblem pattern.