A good kimono quote, which I am paraphrasing is " you do not earn a kimono after an initiation or right of passage, you buy a kimono in a department store".
Nobody in Japan cares if you wear a kimono every day. it does not matter who or where you are.
Some appropriation seems to me to be clear cut. Northern New Mexico and Arizona have lots of people who claim to be Native American healers, and make money performing what they claim to be Native rituals, sweat lodges, and initiations. Then there are the guys who walk around in fake uniforms, pretending to have been in the special forces. Those are both clear cut cases of people pretending to be what they are not, and profiting from it. A college kid wearing dreadlocks only becomes a problem when he falsely claims to be a Sadhu or something.