Color clashing is culturally determined.
For instance, I was always taught that hot pink and bright red should NEVER go together (except maybe on Valentine’s Day).
(Mother says NO)
However, I have seen bright red and hot pink in clothing from other cultures, and not only does it not appear to be considered a clash, I have to say that I think it looks really pretty!
My brother once put on a maroon t-shirt and some light-blue snow camouflage pants and asked me if they clashed.
“YES,” I said, shielding my eyes from the glare. “THAT’S HIDEOUS.”
And yet… I would never say THIS clashed:
So really, “clashing colors” have nothing to do with the colors themselves or how they affect humans biologically. What “clashes” is culturally/socially determined.