Open-crotch pants

Worn by Chinese children during toilet training

Open-crotch pants, also known as open-crotch trousers or split pants, are worn by toddlers throughout mainland China. Often made of thick fabric, they are designed with either an unsewn seam over the buttocks and crotch or a hole over the central buttocks. Both allow children to urinate and defecate without the pants being lowered. The child simply squats, or is held by the parent, eliminating the need for diapers. The sight of the partially exposed buttocks of kaidangku-clad children in public places frequently astonishes foreign visitors, who often photograph them. They have been described as being "as much a sign of China as Chairman Mao's portrait looming over Tiananmen Square."

This keyword could refer to multiple things. Here are some suggestions: