[2][3] He designed both menswear and womenswear, specializing in sporty clothes such as easy-fitting dresses and men's mohair sweatsuits.
[1][3] In 1984, Suppon left fashion to act as Allen's personal manager and collaborator on the musical Legs Diamond, which eventually opened after many delays on Broadway in 1988.
[3] Allen and Suppon worked on the project in Australia before bringing their outline and songs back to Allen's talent manager Dee Anthony, who had harsh words to say about the involvement of a "fashion designer from Brooklyn" in writing a musical, and showed his work to Bob Fosse who was also deeply critical.
[1] The critic John Simon commented in New York Magazine in January 1989 that perhaps the main reason to remember it would be for being the only musical whose book had been "co-scripted by a ready-to-wear designer.
[1][3] In 2021, the designer Louis Dell'Olio, who jointly won the 1977 Coty with Donna Karan,[4] and with her, had been a close friend and contemporary of Suppon, stated that his death was AIDS-related.