Hédāngkù (合裆裤)
The hedangku are a type of unisex loose trousers with an oversized waistband folded and cinched around the waist with a tie. Hedangku are often worn as an undergarment beneath robes or skirts, or paired with a loose top such as a shuhe.
Prior to the Han Dynasty people wore trousers called jingyi (“shin clothing”) without crotches made from two separate legs that tied together at the waist with a wrapped skirt on top to conceal the lower body. Confucian classics even included written rules that people must kneel before sitting and could not sit with both legs forward and spread apart to prevent disgraceful exposure with this style of dress.
Hedangku were developed from Hufu clothing as an alternative to crotchless-trousers. After close interaction with horse-riding nomadic people who wore trousers with closed crotches and narrow legs, Chinese officials began to wear them in court. However, the silhouette revealing two thin legs was considered inappropriate amongst traditional loose fitting ceremonial wear, and so the trouser legs were widened to appear more similar to traditional robes but still provide improved mobility. Thus, the hedangku were developed.
Various styles of hedangku were worn from the Han Dynasty to the Ming Dynasty, and a variety of sub-styles emerged over time. During the Wei, Jin, and Northern & Southern Dynasties periods, a style called fu ku (“bound breeches”) using a string to cinch the legs below the knee became popular to prevent the trouser legs from obstructing horseback riding or labor. In the Ming Dynasty, calf coverings called xi ku (“knee trousers”), could be worn over the hedangku to keep the legs and socks hidden. Women who worked as laborers sometimes wore shorter pleated skirts that fully exposed their colorful xi ku.
Sew Your Own
Interested in making your own hedangku? Use my fantasy hanfu sewing pattern (includes shuhe, hedangku, fanglingpao, and accessories patterns).
Sources Consulted:
Chinese Clothing by Hua Mei
5000 Years of Chinese Costume by Xun Zhou
Hanfu: A Visual Primer of Historical Han Chinese Attire by the Northern California Hanfu Association