Actresses-turned-designers Mary-Kate and Ashley Olsen's obsession with fashion began with re-structuring their costumes on the set of U.S. sitcom Full House.

The 27-year-old twins rose to fame in their breakout role as Michelle Tanner on the popular Tv programme, but have since turned away from life in Hollywood in favour of becoming leading designers in the fashion world.

In an interview with style site's magazine The Edit, the sisters reveal their love for clothes was ignited on the very show that made them famous, as they had to re-imagine their costumes by designers like Chanel and Marc Jacobs, in order to fit their smaller frames.

Ashley reveals, "On Full House we would be in six-hour fittings three times a week, because we had to wear 12 different outfits."

Mary-Kate adds, "We were designing clothes for ourselves as we were so petite, so I think that is when we became obsessed with fit, and now the obsession has become a profession."

In 2006, the Olsens created a high-fashion line called The Row, which has been critically acclaimed by style experts around the world.