In 1968, a little-known actor and occasionally referenced style icon called Steve McQueen wore a custom pair of Persol 714s in the film The Thomas Crown Affair. And, just like that, the retro keyhole nose was turned into an overnight superstar.

Sure, it helped that McQueen was really, really good-looking; but to its credit, the unique bridge detail has endured and remained used on some of the most iconic designs ever since.

(Related: 10 Men’s Accessories That Will Never Go Out Of Style)

Because the detail is not strictly a style of sunglasses and can be applied to any shape, the creative team at Marcolin, which turns out specs for the likes of Ermenegildo Zegna, Diesel and Moncler, says it suits a range of faces.

“It’s a detail that most people can carry and the keyhole adds a touch of individuality without being overstated or showy. [It’s] for the man who wants to be noticed while still having a casual and elegant approach.”

Jaeger’s head of menswear, James Jee, suggests choosing frames that nod to the style’s heritage. “Rich tortoiseshell frames with dark green lenses create an original vintage feel. This style is a classic and is easy to dress up with a suit or dress down with a T-shirt and chinos.”