Love in Vietnam Ao Dai long sleeves, button cuffs, open necklines in a square face and the breast area, and is notably split on the sides from the waist to the ankle. The typical modern female Ao Dai is a tight-fitting long silk dress, worn over long pants reaching the floor. It gives the wearer a simple yet flattering profile. It is worn for special occasions, such as weddings, Luna New Year and other formal occasions. Style it with crystal-embellished sandals for a special occasion.