A dudou is a traditional Chinese article of clothing that covers the front of the torso, originally worn as an undershirt with medicinal properties. With the opening of China, it is sometimes encountered in Western and modern Chinese fashion as a sleeveless shirt and backless halter-top blouse.

A sleeveless shirt is a shirt that is manufactured without sleeves or with sleeves that have been cut off. Depending on the style, they can be worn as undershirts, by athletes in sports such as track and field and triathlon, or as casual wear by both men and women.