The self-made billionaire greeted me at the door as if I was his long-lost friend. I felt as if I had known him all of my life, just hadn’t met him. I had bought two of his sweaters almost seven years ago, when I had lost a lot of weight (which I have since regained), but his clothes aren’t really part of my wardrobe. And yet I have admired them, as well as his stores and his ethics.