Back in the 1960s it was the December issue of Vogue (during Diana Vreeland's reign) that was the big issue of the year, not the September issue. My article on Mrs. Vreeland's magical December issues can be read here on the official Diana Vreeland website.
For the December 1967 issue, an infamous Richard Avedon shoot featured an entirely nude Rudolf Nureyev. When the legendary Russian ballet dancer emerged naked from behind the screen in Avedon’s studio, Mrs. Vreeland described the spectacle thusly: “My dear, you know how it is with men in the morning? Well, it was like that and we had to wait a half an hour for it to go down and it was very strange but rather beautiful.”