The fur caveman vest of the late 1960s fascinates me because it became the mainstream media's go-to symbol of hippiedom -- right down to Sonny Bono sporting one to fake countercultural cred -- and yet it was nowhere to be seen on actual hippies.
It also cracks me up because the "I Asked Mom to Give Me a Byrds Hairdo" and the vest look later popped up on Marvel's Bronze Age take on Frankenstein.