I feel like Halloween is great example of this so I’m gonna use that to explain: In my opinion, if you want to dress as a person or character that happens to be of another culture than yours and you do it respectfully (no darker foundation for example) then I don’t see an issue. The issue comes from when youre dressing up as a race- for example if you buy costumes that aren’t of a soecific person but things like “Native American Girl” costume or “Mexican Man” costume, etc. In a more everyday example, I think it’s best to not wear items that are known universally as sacred to another culture. I’m Native American and headdresses and “tribal” face paint/makeup are a no-go for me. Both of those things are earned within a tribe and it’s very defacing to wear it when it wasn’t given to you by an elder in a tribe. Again that’s specifically for me though, everyone has different views of what’s offensive to them, if you want a safe bet I just wouldn’t wear another cultures items because you never know. Hope this helps a bit!