Even Manchu will not regard cheongsam as their national costume.
Sun Yat-sen's goal is national unity. Although it has some characteristics of Manchu costumes, it is an act of stabilizing ethnic relations.
If we want to improve the Ming Dynasty clothing or Hanfu or something, these national feelings are nothing compared with national interests.
If we want to cancel the national costume status of cheongsam on a large scale and restore the costumes of the Han Dynasty or the Ming Dynasty, it will inevitably arouse the dissatisfaction of ethnic minorities, because China's policy still puts ethnic policy first, and Hanfu is only the costumes of the Han nationality.
In order to control the frontier and stabilize the people, the state will never take measures that generally threaten the stability of the country.