I remember reading in Esquire once that this one guy said the sexiest thing his wife owned was big plain up-to-the-waist white cotton panties. Probably has to do with what garments become associated with a guy's sexual "awakening," kwim?
My late H always remembered a calendar picture he saw at an impressionable age where the pin-up girl was wearing jeans, but they were open and just barely sliding off her hips. Not very revealing, but the picture really stuck in his mind.
Another thing about him... he took a trip to Germany with his grandmother when he was 14, and some older girl cousin of his got pretty frisky with him (this was 1953). She used to sneak off and smoke cigars. For the rest of his life, the sexiest thing in the world to him was a woman holding a cigar... she didn't have to even smoke it... just "hold it," as it were.