How To Wear Sunglasses Like Cary Grant In 'North By Northwest'

They're intriguing, sharp, enduringly classic and mysterious: We're talking about Cary Grant's sunglasses in "North By Northwest." Whereas nobody seems to know what brand they are, it's a heated debate amongst shade geeks and style blogs. Some swear they're Tart Arnels (a descendant of the designer told Slate that's not the case) and others are sure they're Moscots. Either way, the ability to look as good Grant in a pair for yourself is not nearly as unattainable as figuring out their origin. Wa...