What is the origin of the evolution of the cheongsam?

In the early twentieth century it was fashionable to wear a short jacket with flared wide sleeves and a long sleeveless vest with a floor-length front and back hem. Since then, the cheongsam has made some changes in the sides, sleeves, lapels, collars and other places to increase the decorations, and there are complicated changes. But still maintain the old cheongsam vest straight and wide style, attacked the traditional straight-line tailoring, revealing the female figure.

In the late twenties and thirties, the cheongsam was repeated in the length, width, slit height and sleeve length, collar height and collar low and other aspects of the scale of change. In 1929, influenced by the European and American short skirt, the original length of the moderate cheongsam began to become shorter, the hemline shrunk to the knee, the cuffs became shorter and smaller. Later, there were school uniform cheongsams, with the hem reduced to 1 inch above the knee and western-style sleeves. This change was criticized, and after 1931 the cheongsam began to grow longer again, with a drooping hem. In the mid-1930s, the cheongsam was so long that the bottom of the cheongsam fell to the floor to cover the feet, and it was called the "floor-sweeping cheongsam". The sleeves of the cheongsam, which originally covered the wrists, were shortened to the elbows. Later, the sleeve length became shorter and shorter, shrinking to two inches below the shoulder, and after 1936 it was almost sleeveless.

The Qing Dynasty cheongsam did not have a slit, and the cheongsam also had a low slit on the left side when the sleeves were shortened. Later, the slit is more and more high gradually and knee high to the thigh. Because some people are against, robe slit once back to below the knee. But as soon as public pressure was reduced, the slit was quickly raised again, and after 1933 the cheongsam was popularized with a large slit.

The traditional cheongsam was a straight line up and down, with a high stiff collar. In the early thirties, the waist of the gown began to shrink over time, and after 1934, the curves of the female figure were finally fully revealed. The high and ear collar also gradually become shorter, and later some of them became collarless cheongsam.