If you haven't yet read The Beautiful Fall by Alicia Drake [1], please do so. It taught me so much about the early lives and careers of two of the greatest fashion designers of our time: Yves Saint Laurent and Karl Lagerfeld. I even discovered their most private habits and how their inner circle worked. Though sadly we had to say goodbye to Yves this year [2], Karl is still chugging away. How well do you know these two rivals and legends? Take my quiz and find out.

Source [3] and Source [4]