The easiest way I can think to approach this topic is by asking: who is profiting from the sharing of this culturally emblematic dress?
If a Japanese designer began to market kimono or kimono-inspired clothing to westerners? I don't think many would take issue with that, barring perversion of the cultural elements. But unfortunately, it doesn't stop there. Even if a Japanese designer creates a trend and makes a profit for themselves, those who profit most off of the trend are still the mega-fashion companies--the H&Ms, Urban Outfitters (ugh), Targets, etc. Those companies are appropriating Japanese clothing and culture without regard to the importance or lack thereof that it has. It's not really their fashion to use, but they will and have. As a consumer, you can make the decision to make sure that you purchase from the Japanese designer...but very few people who see you wearing the trend will know that you went to that trouble, and will just see the trend catching on.
I'm having trouble thinking of positive examples of this sharing, at least on a large scale. Like anything, if you buy a culturally representative item from an artist on etsy, say, or in a shop while visiting the country of origin, and the people of the culture benefit from the sharing of their culture and you treat the item respectfully, great! But more often than not, mega designers have no regard for the importance of cultural emblems and are only interested in the $$$
This has been an issue of contention with modern designers by the Native American community for some time.
https://medium.com/@a.deroche/appropriation-of-indigenous-culture-in-the-fashion-industry-6f02387ebd26
Meanwhile Native designers feel compelled to make their artwork focused on those culturally emblematic items due to expectations of consumers.
“I don’t want to present this false façade that there’s a story behind it. I don’t rely on that as an artist. Because sometimes there’s not, sometimes it’s just fucking cool! If I happen to use my culture, by all means I’ve been blessed, but I don’t want individuals to be fooled in the sense that this is only where Native Americans get their inspiration. Because it’s not. We don’t rely on, ‘What does this mean?’ But if it has nothing to do with my culture, people tell me it’s not Native enough. Can’t the necklace just be cool?”
https://www.highsnobiety.com/p/native-american-cultural-appropriation/
So other companies are profiting of their design elements, with no sort of payment for the appropriation to the communities. And the artists within them feel constricted by the expectation to only produce culturally specific art. It's a lose lose.https://www.highsnobiety.com/p/native-american-cultural-appropriation/
However, small scale? I fully support buying from local artists when travelling abroad, and wearing those pieces when I return home. That seems appreciation to me. I will say thought, those pieces are almost never part of a trend. That's when you can't tell who is benefiting and who is exploiting.