It was once perceived as a little fast, but in my opinion the double breasted waistcoat worn by André Churchwell is a fine complement to his gray single breasted suit. As I have written in the past, the cut is just rare enough to add interest to an otherwise conservative ensemble. It is probably a bit too dandified for very conservative offices but perfect for a well established man like the good doctor who can wear what he wants.
Churchwell's ensemble also demonstrates the efficacy of both the pink shirt and the necktie with a black ground in combination with gray jackets. Each looks better than blue would in this context. Not to mention that the dark gray is complemented nicely by black shoes (as would be a dark brown suit, but that is for another time).