Not so long ago everyone (sort of) in China wore the ubiquitous 'Mao suit.' It was really a misnomer as that style was adopted by the Guomindang (KMT) in the decade after the collapse of the Qing dynasty. Communist party members also started wearing it, after Dr. Sun Yatsen invited the Communists to join the Guomindang. The style became everyday wear for Chinese people right through from the 1920s. to the 1970s. After Mao's death and the victory of the rightwing of the CPC, fashion started to change as we shall see.
Here's a rare photograph of Mao Zedong (on the right) and Chiang Kai-shek (centre) together in 1945. (the westerner is US ambassador Patrick Hurley):
As you see both Mao and Chiang are wearing, what was then called the Zhongshan suit.
By the 1990s Chinese people were increasingly wearing western clothing .... and now - just look at these girls go at Sochi