Today I had an odd thought about the Grey aliens, the ones with the huge eyes and heads. Basically, it was a thought about why they're often depicted as being naked. As some of my clothes made me itch earlier today, I thought maybe the Greys are a highly evolved autistic species. If so, then the smarter they got and the bigger their brains got, the more things like clothing bothered them, so they began going about naked because clothing would drive them insane with itchiness.
Just a random thought about something that may or may not exist. :-)