LONDON — Gal Gadot, DC Comics and the whole Justice League gang are not the only big winners from “Wonder Woman,” the film franchise that has already taken in more than $780 million globally; it just seems to keep on giving (and is already gearing up for a sequel). The latest beneficiaries of the movie’s halo effect: Whitaker Malem, the London leather designers behind the super heroine’s metallic leather armor as well as the armor for her fellow Amazons. They’re this season’s breakout British brand.

“Wonder Woman is our calling card at the moment,” said Keir Malem, 52, sitting with his partner, Paddy Whitaker, also 52, in the loft-like ground floor of their two-story home and atelier in Dalston, East London. Dotted around the walls are mementos from their travels mixed in with seminal artworks from the 20th-century Italian maestro Lucio Fontana and a 1970s 3D spotted torso by the British pop artist Allen Jones. The two men, who uncannily look and dress alike, had just returned from a five-month stint making more leather armor on location in Australia for Wonder Woman’s sister movie, “Aquaman,” scheduled for release in December 2018.

Just upstairs from where they were sitting was the atelier where the Wonder Woman armor, commissioned by Lindy Hemming, the film’s costume designer, was born. The two work at side-by-side desks, and pictures adorn the main wall, including a close-up of the Wonder Woman costume made before it was metallicized. Torsos fitted with leather corsets litter the room, while hidden at the back is a vintage 1950s Singer sewing machine, bought at North London’s Chapel Market for 60 pounds in 1988. On it, Mr. Malem said, “everything is done, even though it wasn’t made for sewing leather.”

Called “beyond cool” by New York magazine, Wonder Woman’s armor has become a breakout star in its own right. “We were allowed to go close to the body and do sexy armor, which is unusual, as a lot of armor is massive,” Mr. Malem said.