Two pieces of food for thought:
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https://www.scmp.com/news/china/article/3198984/china-chic-trend-builds-young-peoples-patriotism-cultural-confidence (Chinese people starting to dress in the Han fashion again)
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https://web.archive.org/web/20210210074724/https://www.nytimes.com/2021/02/10/world/asia/new-zealand-rawiri-waititi-tie.html (Māori politician kicked out of parliament for not wearing a necktie, turns into a whole dispute, eventually wins)
Now if you look at Chinese parliament, well I don't have to tell you what you'll see.
What would it take for Chinese politicians to start appearing in Han dress?
(not advocating for this, just a stray thought I had)
I think if it does happen they probably won't wear the traditional dress from 100 years ago anymore than americans would dress like puritans
China might have a fashion movement based around traditional styles but no way are they going to all start dressing like their great grandparents