[Avodah] Das Moshe or Das Yehudis

[Yitz .]

I don't if this has been discussed here, but the tznius conversation led me
to the following question.
If a community starts keeping a "chumra" in tznius because of a mistaken
belief that it is absolutely required, does that become 'das yehudis' or is
it only something that is accepted as minhag or chumra that becomes das
yehudis?
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