He was partying, having fun, but then during that period everybody was doing coke. It was unbelievable. He wasn’t close to the worst of the lot. I mean, I worked with Harry Nilsson for thirteen months, and that was tough. He was just doing what everybody else was doing. He was such a gentleman. He’d even pick up the trash after his sessions, which I’ve never seen another artist do, especially one of David Bowie’s stature. He would say it was his session so he should clear it up. He’d send Christmas cards every year, which looked like he’d made them himself.
… One time, a friend of mine’s eighteen-year-old son needed a suit, so he brought him into the Floral Street store. The boy tried the suit on, came out of the changing room, and looked into the big mirror we had. At the same time, the door to one of the other changing rooms opened and out walked David. “Wow, you look great!” he said to the kid. “You look really great, man!” And this boy nearly passed out, he went pale white! Nearly fainted! That was just David. He seemed to pop up everywhere.
David Bowie: The Oral History
(Excellent book. Highly recommended.)