Sbai, sabai (Khmer: ស្បៃ; Thai: สไบ, rtgs: sabai, pronounced [sābāj]; Lao: ສະໄບ), or pha biang (Lao: ຜ້າບ່ຽງ; Thai: ผ้าเบี่ยง, pronounced [pʰâː bìa̯ŋ]) is shawl-like garment, or breastcloth worn in mainland Southeast Asia. The term "sabai" is used for a woman's silk breast wrapper in Cambodia, central Thailand, southern Thailand,northern Thailand, Isan, and Laos while in coastal Sumatra it described as a shoulder cloth..." Sabais can also be worn by men in Lao weddings or when attending religious ceremonies. The type of sabai typically worn by Lao men often has checkered patterns. Sabai also well known as a long piece of silk, about a foot wide, draped diagonally over the chest covering one shoulder with one end dropping behind the back."
The sabai is Cambodia's national costume tie with its ancient's sampot and chang kben.
Along with the shoulder sash, selendang of Malay and sabai of Cambodia may have been derived from the Indian garment called a sari, the end of which is worn over one shoulder, as most Southeast Asia countries were ruled by Indianized kingdoms.