Graham Churchyard is a UK-based costume designer. Previously, as a costume effects supervisor, he went on to work with Lindy Hemming on the Christopher Nolan Batman trilogy, collaborating with Lindy and Chris to create new Bat suits; and later, Bane and Cat Woman. It was at this point that Graham secured his position in the superhero costume world, working for the Marvel and DC franchises. He headed specialty costume departments on 'Captain America: The First Avenger', 'Thor: Dark World', 'Guardians of the Galaxy', 'Avengers, Age of Ultron', 'Justice League', and 'Spiderman, Far from Home', pulling together huge teams of makers to bring many extraordinary costume concepts to life.
Information above via his IMDb page.