YSL was created by couturier Yves Saint Laurent, who revolutionized the usual perception of fashion. He turned national costumes and military uniforms into everyday outfits, dressed women in trousers and tuxedos, and laid the foundation for ready-to-wear. All this he was able to achieve by teaming up with partner Pierre Berge. The co-founder of YSL was responsible for running the business and awarding important contracts. Commercial issues depended on Pierre Berge, and everyone recognized that a hobby for Saint Laurent would never be a way to make money without him.