Bijia (Chinese: 比甲) is a long, sleeveless jacket of Mongol origins which has opened side slits.

[2][7] Empress Chabi designed the bijia so that it would be a convenient form of attire while riding horses and shooting arrows.

[9] In the Ming dynasty, the bijia was long in length and would reach below the knee level.

[3] Bijia created an illusion of slenderness, which women in the Ming dynasty sought after.

[4] The bijia remained very popular in Qing dynasty,[9] and it was one of the most common forms of female clothing worn in the 17th and 18th century.