In Back to the Future ( 1985) Lorraine calls Marty McFly as Calving Klein because of the underwear. In that year CK wasn't famous outside the US, thus they changed it to
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Back to the Future (1985) - FAQ - IMDb
Calvin Klein, Futurepedia
Calvin Klein, Futurepedia
Scene 9: Calvin & Lorraine
Marty McFly Calvin Klein Scene: Hilarious Back to the Future
Why doesn't George McFly suspect Lorraine of continuing an affair with Calvin Klein/Marty when their son looks identical to the kid she had the hots for in school? - Quora
back to the future — “Calvin Klein?”
Marty McFly Calvin Klein Scene: Hilarious Back to the Future
NewtCave: Recap: Back to the Future Part 3: Present Perfect
NewtCave: Recap: Back to the Future Part 3: Present Perfect
