Ao Dai, the Vietnamese long dress

Wikipedia.org: Ao Dai
The áo dài is a Vietnamese national costume, now most commonly for women. In its current form, it is a tight-fitting silk tunic worn over pantaloons. The word is pronounced ow zai in the North and ow yai in the South of the country. Áo is derived from a Middle Chinese word meaning "padded coat" (襖).Dài means "long".