If you haven't yet read The Beautiful Fall by Alicia Drake, 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, Karl is still chugging away. How well do you know these two rivals and legends? Take my quiz and find out.

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