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)
a) iterating on a particularly revolutionary group of peoples existing style---sans culottes made everyone stop wearing culottes through imitation---so like paris commune 2 a bunch of people dress like firemen after they were the ones who broke down the gates of parliament or something.
b) ostentatious state experimentation, the funniest thing about weird and innovative styles from the 1790s-1814 is that more often than not they were dreamt up by some committee and forced officials to wear them, gaze upon these silly bastards