The ao dai, combined with a non la, Vietnam’s famous conical hat, graces most promotional materials for Vietnamese tourism, from guidebooks to posters. Courtesy Ronan O'Connell
The ao dai, combined with a non la, Vietnam’s famous conical hat, graces most promotional materials for Vietnamese tourism, from guidebooks to posters. Courtesy Ronan O'Connell

Ao dai: Vietnam's most recognisable outfit is rooted in an ancient Islamic kingdom