After studying fashion at the Edinburgh College of Art, Stewart went on to work for acclaimed couturier Donald Campbell. He set up the Stewart Parvin label in 1995 initially designing a couture day and evening wear range, an event marked by the opening of his own boutique. Stewart designs two couture collections per year, which are viewable by appointment at the Motcomb Street boutique. In 2007 he was awarded the Royal Warrant of Appointment to HM the Queen in recognition of his work, having designed for Her Majesty for a number of years. Stewart also designs a hugely successful bridalwear range which is stocked internationally and in the UK.