I don't think we need neo-Pagans. This could well happen in the stone age - people deciding the clothing is too restrictive and that it impairs their ability to fight and survive. From there, we have the Native Americans, who even ITTL wore little due to warm climate, and other OTL peoples, who adopted clothing. All we need is the other peoples to have the South America mindset... excepting occasional fur cloaks for winter.