Part of her success in London may have been due to her close working association with the royal household's couturier Norman Hartnell, who chose her to make his hats just before the 1953 coronation. He enabled Saint-Cyr to set up her millinery salon within his London fashion house. "The Australian Women's Weekly" described Saint-Cyr's association with the royal family and Hartnell in 1960: "She drives to the Palace or Clarence House in Norman Hartnell's Rolls-Royce and etiquette demands that she go hatless". The article added that all her royal customers spoke to their Parisian milliner in French during fittings.