Gerald McCann trained at the Royal College of Art under Madge Garland. On graduating he worked in London couture, and established his own wholesale business.
Like other RCA graduates, Gerald played an influential role in the development of the UK fashion industry. He designed dress pattern for Butterick. Paper patterns meant that anyone could wear the latest fashions for the price of a couple of yards of fabric.
He became a key supplier to Woollands 21 Shop and achieved great success on both sides of the Atlantic, designing for many shops including Bazaar, Harrods, Peter Robinson in the UK, and Bloomingdales, Saks, and Bergdorf Goodman in the USA.