Although Cheongsam and Samfoo weren’t considered as the Chinese traditional attire; they are the adaptation of the Manchu clothing during their reign from 1644 to 1911 in China (read about the history of Chinese traditional attire), but in Malaysia, these attire commonly be seen during the Chinese New Year Celebration and other formal gatherings.
The Cheongsam, can be recognized with its high collar, buttons or frog closures near the shoulder, a snug fit at the waist and slits on either one or both sides. 
Samfoo consist of loose and slit shirts with high collar, and worn with loose trousers like a Malay shirt. The samfoo is usually made of silk.
The real traditional clothing of the Chinese is the Hanfu, which descend from the Han’s culture way before the Manchurian’s reign.
Hanfu – consisted of a yi, a narrow-cuffed, knee-length tunic tied with a sash, and a narrow, ankle-length skirt, called chang, worn with a bixi, a length of fabric that reached the knees.
But if the Hanfu was the traditional attire, why it doesn’t get enough recognition from the world? If you are interested, visit this website discover the truth about it.
Sources
http://www.malaysia.travel/en/nl/about-malaysia/culture-n-heritage/traditional-attire
https://en.wikipedia.org/wiki/Malaysian_cultural_outfits
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