forced the women to wear Chinese-style pants. The following Lê dynasty also criticized women for violating Confucian dress norms, but only enforced the dress code haphazardly, so skirts and halter tops remained the norm. During the 17th and 18th centuries, Vietnam was divided into northern and southern realms, with the Nguyễn lords ruling the south. To distinguish the southern people from the northerners, in 1744, Lord Nguyễn Phúc Khoát of Huế decreed that both men and women at his court wear trousers and a gown with buttons down the front. The members of the southern court were thus distinguished from the courtiers of the Trịnh Lords in Hanoi, who wore áo giao lĩnh with long skirts. According to Lê Quý Đôn's record in the book "Phủ Biên Tạp Lục" (recording most of the important information about the economy and society of Đàng Trong for nearly 200 years), the áo dài (or rather, the forerunner of the áo dài) created by Lord Nguyễn Phúc Khoát based on Chinese Ming Dynasty costumes, by how to learn the method of making costumes in the book "Sāncái Túhuì" as the standard. 19th century The áo ngũ thân (five part dress) had two flaps sewn together in the back, two flaps sewn together in the front, and a "baby flap" hidden underneath the main front flap. The gown appeared to have two-flaps with slits on both sides, features preserved in the later áo dài. Compared to a modern áo dài, the front and back flaps were much broader and the fit looser and much shorter. It had a high collar and was buttoned in the same fashion as a modern áo dài. Women could wear the dress with the top few buttons undone, revealing a glimpse of their yếm underneath. 20th century Modernization of style Huế's Đồng Khánh Girl's High School, which opened in 1917, was widely praised for the áo dài uniform worn by its students. The first modernized áo dài appeared at a Paris fashion show in 1921. In 1930, Hanoi artist Cát Tường, also known as Le Mur, designed a dress inspired by the áo ngũ thân and by Paris fashions. It reached to the floor and fit the curves of the body by using darts and a nipped-in waist. When fabric became inexpensive, the rationale for multiple layers and thick flaps disappeared. Modern textile manufacture allows for wider panels, eliminating the