Did you notice that if you click on the clothes in his room you can dress him?
I can see it now...
Caveman shows up at party in bahama shorts, black tie and workout jacket.
"So...did you dress in the dark?" said the puzzled guest.
"No, it was the strangest thing. I laid out some clothes, the fuse went out on the microwave and when the lights came on, I looked like this!"