The Decorum was founded in Bangkok by Guy (Sirapol Ridhiprasart) and Ball (Warong), two classic-menswear enthusiasts who wanted a shop in Thailand curating the tailors and brands they'd spent years tracking down on trips abroad. Ball's family background in the garment industry fed into how the pair select what they carry, an international roster spanning Crockett & Jones, Drake's, John Lobb, and Alden. It has since expanded into a Singapore location alongside its original Bangkok shop, and runs its own in-house lines including The Decorum Tailoring and a collaboration with designer Yasuto Kamoshita.