Kate Middleton has been called the unofficial brand ambassador of British fashion label Issa. Now the company has been bought by Camilla Al-Fayed, the 26-year-old half-sister of Princess Diana’s late boyfriend, Dodi Al-Fayed. By Isabel Wilkinson. Rex; Rex; AP; Rex The Duchess of Cambridge donned a purple Issa jersey dress to attend the Canada Day celebrations in Ottawa on July 1. David Rose, Pool / Getty Images To officially announce her engagement to Prince William in November 2010, Middleton wore a midnight-blue Issa wrap dress—which perfectly matched her sapphire engagement ring. The frock sold out in 24 hours and sparked a craze of “little blue dresses.” Sang Tan / AP Photo At the wedding of their friends Harry Meade and Rosie Bradford last October, Middleton wore a blue Issa dress with a fascinator hat. Mark Stewart, Camera Press / Rex USA On a shopping trip on King’s Road in London in April, Middleton wore a simple black wrap dress by Issa. Steve Allen / Rex USA On the way to the office in August 2007, Middleton wore a printed wrap dress by the designer. Rex USA Middleton partied at the London nightclub Boujis in a printed Issa dress in August 2007. Rotello, MCP / Rex USA Kate swanned in a gray Issa dress with a plunging neckline at a gala for the Starlight Children’s Foundation at the Saatchi Gallery in London in September 2009. Alan Davidson / Rex USA To attend the Boodles Boxing Ball in June 2008, Middleton wore a slinky pink dress by Issa, which she paired with a black clutch. Alan Davidson, O'Neill / Rex USA