I've been asked many times whether it's okay to wear a black shirt with a black suit. The short answer is no. The long answer is, unless you're George Clooney, and you can maybe, JUST maybe pull it off, I would recommend another colored shirt. Truth is, there are too many other options out there to wear just black on black. It becomes hard to tell the separation of clothing, and it makes two potentially great looking pieces look like one mediocre piece.
I know some of you may want to look sleek wearing dark colors at a club or lounge. If you must go with a dark color on your black suit, I'd say use a grey shirt instead of black.