Cultural appropriation within the fashion world is a controversial subject. Style icons draw on a variety of inspirations for their __lewks__ and sometimes channel periods or cultures they don't belong to. For example, a LOT of celebrities wear corsets despite not being eighteenth-century courtesans - and yes, to answer your question, I'm counting waist trainers as corsets.
That's obviously a facetious example - but I DID wear bindis as a pre-teen to honor 90s-era Gwen Stefani, which makes me cringe in retrospect. Though Gwen came in contact with Indian culture - she dated Tony Kanal, No Doubt's Indian-American bassist, and learned about Indian aesthetics through his family - her appropriation of that 'accessory' wasn't, um, appropriate. And don't even get me started on the Harajuku wave of her career.