He's survived bankruptcy, two marital breakdowns and a persistent habit of referring to himself in the third person: Ozwald Boateng remains a force to be reckoned with. The first black tailor on Savile Row and former creative director of Givenchy, Boateng this month releases A Man's Story, his 12-years-in-the-making film of his remarkable career. "I'm not nervous about the film, I'm excited - it's like the first time I sold a suit," he explains to GQ.com, sitting in an elegant café in London's Mayfair. "I was always the youngest one around. When I went to Paris for my first catwalk show I was always the kid. Now I'm 45 years old. I've got mileage in the tank." Here he explains how men should wear colour, why Giorgio Armani still inspires him and why everyone should follow the sartorial example of ageing rockers…