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

Calvin Klein, Futurepedia

Varsity Yearbook & Review 2022 - Varsity Issue 902 by Varsity

Marty McFly Calvin Klein Scene: Hilarious Back to the Future

In Back To The Future, why do people keep calling Marty McFly

Calvin Klein, Futurepedia

In Back To The Future, why do people keep calling Marty McFly

In Back To The Future, why do people keep calling Marty McFly

Poor Product Placement — Calvin Klein - Back to the Future (1985

Calvin Klein, Futurepedia

Calvin Klein, Futurepedia

B to the F: The Novelization of Back To The Future on Tumblr: Marty wakes up in bed and again we play Movie Vs Book! Movie dialogue in bold, extra book dialogue

Calvin Klein, Futurepedia

DeLorean Hire - Hire from Sandstone Productions

Back to the Future] So, my friend from high school, Lorraine, had

Marty Meets Lorraine His Mom in Her Room - Calvin Klein purple