When I talk about sexual selection I usually make sure to have an accompanying visual of a peacock to go with the post. But really I could have used a dandy as an illustration, or perhaps in our day & age “The Situation”. Unlike the peacock much of what passes for human “plumage” is not a result of native biological processes, but rather refashioning the materials of other organisms or synthetics into a sort of second skin (or skins with all our layers). In other words, clothes. These artificialities are so essential to our own identity as individuals that they often mark out our tribal affiliations, in pre-modern and post-modern contexts. Whole industries exist to cater to both our utilitarian needs and aesthetic sensibilities in regards to how we dress ourselves. The definition of a cyborg usually connotes a synthesis of biological with electronic. Perhaps that is because our artificial extensions in the form of clothes have seamlessly merged with our self-images, to the point where it would be ludicrous to perceive ourselves as merged entities. If you encountered many of your acquaintances or friends naked not only would embarrassment ensue, but I suspect one might initially not recognize them. A naked physique without distinctive aspects of clothing one associates with someone strips away individual identity.
But clothing has not been the eternal condition of man, recall that Eve met the fig leaf after an unfortunate sequence of events. In all likelihood our common ancestor with bonobos and chimpanzees were predominantly hirsute, as are most mammals. A mammal without fur is like a fish without scales and birds without feathers. Not impossible, but atypical. But at some point we did lose our fur. When? A 2004 paper offered up an intriguing possibility, that ~1.2 million years ago our lineage became hairless. How did they come to this inference? The authors noted that the consensus sequence of the MC1R locus in humans among dark skinned peoples coalesced back to this period (i.e., the last common ancestor of the MC1R genes which exhibit the ancestral type, which confers dark skin). Once our ancestors lost their fur then they would have been exposed to solar radiation, and so the necessity of dark skin. When did this naked dark ape cover his shame? (yes, I censored one of the images above to make this post “work safe” above the fold) A new paper in Molecular Biology & Evolution offers up a precise date using another proxy, Origin of clothing lice indicates early clothing use by anatomically modern humans in Africa: