The most tragic moment of my life was the first show I ever designed for. I had been asked to make shoes for Ossie Clark's show in the early '70s. I was so inexperienced that I didn't put the steel in the heels of the shoes, which is required to support the shoe and the wearer. So the girls came out walking very strangely in these rubber, bendy high-heeled shoes I had made. I thought 'Oh dear god! This is the end of me.' But after the show, even David Hockney and Cecil Beaton said to me 'It was so interesting that the girls were moving in such a different way.'