Please do not let prejudice and ignorance become the core of your reasoning for your cultural stance. Generally speaking, the civilizations of Asia are much older than any European country, kekw America is not even considered...Tho it's true that Couture and luxury fashion are historical products of European society, something they proudly boast about as evidence of their "superiority" over other continents. The only thing they might deny as their own is imperialism, but ironically, that's the "heritage" the rest of the world knows them for the most. For instance, in my birthplace of Siberia (North Asia), people may not know much about fashion, but most have heard about what the US did in Vietnam in the 1960s.
Returning to the topic of couture customers, evaluating Asian customers (including Russians and Eastern Europeans) as unsuitable might be a bit biased, considering it is clear that you are judging from the perspective of Americans/OG Capitalist countries Europeans, through the lens of "fashion scholars in fashion capitals" to judge the rest of the world. Europe and the Upper East Side of US benefit from the Gulf Stream, having a very favorable and temperate climate, neither too hot nor too cold like the regions in Asia, that in itself is a privilege, honestly!
Instead of making such narrow-minded remarks, maybe try learning about dialectical thinking and the cultural values that evolve over time. Don’t just "see the trees without seeing the forest." Approach the issue in a more worldly manner! Drawing cultural conclusions from a pair of pants or a dress is rather ridiculous lol