What Sean said. In việt culture we have the traditional ao dai which is common to wear for Lunar New Year and weddings. I've had family members get married to white people who wear the ao dai, which is totally appropriate and makes sense for them to do so at the wedding and I'm not upset by it. I've never seen some random person out and about wearing an ao dai for no reason, though. I wouldn't be outraged by it but I'd definitely be wondering why they're wearing that out and about when there are probably more comfortable options