I have no idea how long the Hot Librarian stereotype has been, as the young folks say, a Thing, but clearly it existed back in 1965:
Now if someone will kindly explain to me where we’re supposed to get liquid chiffon. (No, not the stuff in the tub; we don’t want to tick off Mother Nature.) There exist two more ads in this series, with different photos but identical text.
I must also point out that Globe Hopper has come up with a variation that, she says, promotes intelligence, and we all could use more of that.