What is "cultural appropriation" ? None of the examples thus far are specific to an entire culture: blues music, tattoos, artistic designs. A specific "thing" (any of the aforementioned)may have originated with a select group of people and this "thing" may have been fairly prominent among many people in a specific geographical area...but it was not all of those people and there are various differences, and adaptions, not to mention general dislike. The term "culture" is a monstrously large term that really doesn't hold any true value in describing a group of people. Because a group of people (i.e. a "culture") is a collection of independent people with differences. Is blues music "black culture? No. The style of music may have originated with some black artists but that is not, in any way, even a defining aspect of "black culture." Same with tattoos, or tribal designs, etc. Can/could you be a Maori without a tattoo? I'm sure someone has.
So a white fashion designer sees a pattern from and decides to copy that pattern. It is unlikely that the design was a defining piece of the entire group of people. It is far more likely that the design was specific and "owned" by a small group of people. Then you could argue for stealing, infringement, copyright, etc. But it's not an entire culture. To say that an entire group of people are defined by one specific thing is usually inaccurate.
I don't believe in "culture."