The season that began with the question, "Who is Don Draper?" comes to a close on Sunday night. Did we really get the answer to that question? Debatable. Did we get treated to some pretty incredible 1964 fashion along the way? Unquestionably. We're sending Don, Peggy, Joan and Betty off in style with a gallery of their best looks from season four. Tell us your favorite Mad Men fashion moments in the comments below, and tune in to AMC for the season finale this Sunday at 10PM EST.