When a man is in the mood to be dandy, an odd vest is to my mind the easiest and least expensive way to express one's inner peacock. Consider for example Dr. André Churchwell in the photograph, and then compare him to his more conservatively attired self. The element that pulls the eye is the vest (and to a lesser extent the mid-brown shoes).
Lavishly large lapels and bright red suitings have their adherents, but are unnecessary. Simply change the vest on an otherwise ordinary business suit.