I'm pretty idiosyncratic about about clothes and fashion myself. I tended to follow, somewhat, what was in when I was younger, and less so after I worked with a chemist and artist (same person) who shopped at thrifts, in my thirties. I got more playful, her taste really woke me up. Then sometime later I stopped with thrifts for a while, and got more ordinary.
Then in my fifties, I hit the thrifts again, and haven't stopped yet.
All the while, until recently and including when I was a teen, I've followed style magazines or blogs for interest both in style and style culture. The blogs varied.
But, as to black, I wore a lot of black - sometimes but not always - in the early sixties, sort of a take on the then bohemian culture (which was waning, if I remember). I was comfortable with it and still am when I wear blacks.
Have to edit - I'm right now not sure of the year, almost but not quite. Could have been '93, and October, makes more sense, but also fits more with memory.
Here, though, is one of my favorite photos of the ones I took on one of my much later trips to Italy. This was in 1999, early April, at a train station west of Florence.
Wearing black can be cultural past individual or goth/punk:
black from the train
Adds, some folks get into a uniform - for efficiency, ease, self association. I never did that, as I wore uniforms for twelve years, four of them very very ugly uniforms. I can imagine those using a lot of black.
My business partner, not all that long ago, wore a lot of black, grey, and red. Went with her grey black hair.