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Men's traditional clothing in late imperial China

Changshan (; AUDch2an˥), also known as changpao , and dagua , is a form of paofu, Chinese robe, which was derived from the Qing dynasty qizhuang, the traditional dress of the Manchu people, which were worn by Manchu men. The changshan was actually developed by the Han Chinese through the modification of their own Ming dynasty's Hanfu by adopting some Manchu men's clothing elements in one of their Hanfu changshan. Manchu men wore a type of changpao which reflected its equestrian origins, which was originally designed for horseback riding, known as [[Qizhuang#Ordinary dress (Changfu)/ casual dress (Bianfu), which was characterized by two pair of slits (one slit on each side, one slit on the back, and one slit on the front) which increased ease of movement when mounting and dismounting horses, a [[Garment collars in Hanfu#Pipa shaped collar collar (a collar which curved like the alphabet《S》), and the sleeve cuffs known as matixiu
The Han Chinese thus adopted certain Manchu elements when modifying their Ming dynasty changshan, such as by slimming their changshan, by adopting the [[Garment collars in Hanfu#Pipa shaped collar collar of the Manchu, and by using buttons and loops at the neck and sides. Despite the shared similarities with Manchu's neitao, the Chinese changshan differed structurally from the Manchu's neitao. The Chinese changshan only has two slits on the sides lacking the central front and back slits and lacked the presence of the matixiu cuffs; the sleeves were also longer than the ones found in the neitao.

The precursors of both the changshan and the qipao were introduced to China during the Qing dynasty (17th–20th centuries). The Manchus in 1636 ordered that all Han Chinese should adopt the Manchu's hairstyle as well as their attire of dress or face harsh punishment including death penalty. However, by the time of the Qianlong Emperor, however, the adoption of Manchu clothing dressing code was only required to the scholar official elites and did not apply to the entire male population. The court dress of the Qing dynasty also had to follow the attire of the Manchu people; however, commoner Han men and women were still allowed to wear the hanfu under some circumstances and/or if they fell under the exemptions of the Tifayifu policy. The order of wearing Manchu's hairstyle however still remained as a fundamental rule for all Chinese men. Over time, the commoner Han men adopted the changshan while Han women continued to the wear the hanfu predominantly in the style of aoqun. The traditional Chinese Hanfu style of clothing for men was gradually replaced. Over time, the Manchu style of male dress gained popularity among Han men. Changshan was considered formal dress for Chinese men before Western style suits were widely adopted in China. The male changshan could be worn under a western overcoat, and topped with a fedora and scarf. This combination expressed an East Asian modernity in the early 20th century. The 1949 Communist Revolution ended the wearing of changshan and other traditional clothing in Shanghai. Shanghainese emigrants and refugees carried the fashion to Hong Kong, where it remained popular. Recently in Shanghai and elsewhere in mainland China, many people have revived wearing the Shanghainese changshan. It is made of silk.

Changshan are traditionally worn for formal pictures, weddings, and other formal Chinese events. A black changshan, along with a rounded black hat, was, and sometimes still is, the burial attire for Chinese men. Changshan are not often worn today in mainland China, except during traditional Chinese celebrations but, with the revival of some traditional clothing in urban mainland China, the Shanghainese style functions as a stylish party dress (cf. Mao suit).