- https://www.aodaistyle.com/ The origins of the Ao Dai can be traced back to the 18th century, when it first emerged as a form of formal wear in Vietnam. Originally, it took the form of a long gown paired with trousers, influenced by both the distinctive styles of Chinese clothing and local customs. The Ao Dai underwent various transformations through the years, particularly during the French colonial period, when it was modernized to align with Western fashion trends.