The 1580s were a time great lovemaking throughout Europe. So much so that basically everyone had syphilis. And without modern medicine, this meant—for many—open soars, blindness, dementia and baldness. Of these, Europeans found baldness to be the least tolerable.
So when the kings of England and France had dueling syphilae microbes laying waste to their follicles, they commissioned local wig makers to fix the problem. But the dementia among the syphilitic wig makers led to massive, curly beasts for the head, powdered with fragrances to mask the various olfactory offenses flowing through court.
“Bigwigs” then galavanted throughout the continent until a tax was levied on wig powder in 1795, whereupon all sex stopped, and natural hair got its European reboot.