This doesn't need to be a black-white thing. White people also use the culture of other white culture in odd, wrong or offensive ways. Within every skin color there are many different cultures.

And whether you engage in appropriation or not I guess depends on historical context and how you use it. Here in Norway we have traditional outfits dating back to the 1700 to 1800s which we use in wedding and celebrating national day.

Most of us are honored by immigrants who put on these outfits and celebrate with us. I actually find it more offensive when Americans who claim Norwegian descent run around with cheap knock-offs of these outfits and treat it like some sort of carneval or dressup for fun kind of event.

Our national costume, Bunad is not like putting on a pirat outfit and it is offensive when people treat it like that. But when you put it on because you are embracing the culture and want to join in the celebreation, then it is just an honor.

Thus I think context is vital in how you see cultural appropriation. And it depends on what it is. Like I could not care less about people putting on silling viking outfits and getting drunk. The viking heritage is too far back and has no relevance in our current cultural expression, to matter.

And it matters the role of the people. Like I would be careful about using the outfits of the Sami people, because they have traditionally been oppressed.

Even if I as a native Norwegian looks almost the same as a Sami, doesn't mean I have a right to put on their outfit and use in whatever way I like without potentially disrespecting them and their culture. Especially since there is a nasty history of mocking them for their clothes and style.