The whole Calvin Klein craze started 40 years ago when the designer's best friend Barry Schwartz lent him $10,000 to start a collection of women's coats. He's come a long way since then. In four decades, Klein has created a global empire with sub-brands like Calvin Klein Collection, Calvin Klein Jeans, and Calvin Klein Underwear. Klein practically made Kate Moss a household name by using her for several racy underwear ads, and was responsible for taking Christy Turlington to supermodel status. The list goes on and on. In celebration of the label's 40th birthday, take my fun little quiz about the man whose clothing has been worn by millions of people around the world.