Designer Lan Huong measures a guest before making an Ao dai at a clothes store in Hanoi, Vietnam, Oct. 25, 2018. Ao dai is the national costume of Vietnam. It's a tight-fitting silk tunic worn over pants. It originated in the 18th century and developed in the 19th and early 20th centuries. [Photo: Xinhua]

Photo taken on Oct. 25, 2018 shows the pattern embroidering process of making an Ao dai in Hanoi, Vietnam. Ao dai is the national costume of Vietnam. It's a tight-fitting silk tunic worn over pants. It originated in the 18th century and developed in the 19th and early 20th centuries. [Photo: Xinhua]

Photo taken on Oct. 25, 2018 shows the process of painting embroidered patterns before making Ao dai in Hanoi, Vietnam. Ao dai is the national costume of Vietnam. It's a tight-fitting silk tunic worn over pants. It originated in the 18th century and developed in the 19th and early 20th centuries. [Photo: Xinhua]

Photo taken on Oct. 25, 2018 shows workers sewing an Ao dai, the national costume of Vietnam, in Hanoi. It's a tight-fitting silk tunic worn over pants. It originated in the 18th century and developed in the 19th and early 20th centuries. [Photo: Xinhua]

Photo taken on Oct. 25, 2018 shows cloth cutting process of making an Ao dai in Hanoi, Vietnam. Ao dai is the national costume of Vietnam. It's a tight-fitting silk tunic worn over pants. It originated in the 18th century and developed in the 19th and early 20th centuries. [Photo: Xinhua]