Style or anti-style - the insistence on attacking life in one's own way, this is the prerequisite for the style itself.
If you wear a black suit or jacket it always looks great with a white or black shirt. Try wearing it with a pale blue shirt, it often softens the effect. Blue and black are a great combination.
Wearing trainers with a suit, it's now the modern way to make it feel more casual. Make your suit or jacket work for you not the other way round.