No matter, through osmosis, and prep's influence on Italian, French and Spanish luxury sportswear, Ivy style still pretty much defines what smart – and I mean, sharp – casual is about.
From late-night Hollywood bars to the jazz clubs of Manhattan, the Ivy League uniform of button-down shirts, natural-shouldered jackets and penny-loafers was the go-to style for film stars, politicians and musicians alike. Dustin Hoffman, Paul Newman, Steve McQueen and Jack Lemmon – they all wore it, and they'd never look better.
Here then, a pick of my favourite famous preppies in the years before America lost its innocence, when no one had heard of Vietnam or Agent Orange or dress-down Fridays. An America you really could believe in.
Keep it sharp, gents.