The man, Dalontee Edgerton, is an ex-Secret Service agent who has served as Pharrell’s personal bodyguard for the past six years. He also happens to outdress just about anyone at fashion week.

I first noticed Edgerton last year at Pharrell’s western-themed Louis Vuitton show. I could tell he was security as he methodically worked the rope line at a post-show reception, but he looked ...