You will not be able to have a suit that is both technically appropriate for a true "black tie" setting as well as less formal setting where men will only be in suits. What you are looking for is either a Midnight Blue or Black suit. One button, peak lapel, & double vented. Put on a cummerbund and black bowtie and you have something that resembles and may even pass off as a tuxedo. Wear a long neck tie or open collar and you have a dark suit that will be appropriate for less formal evening events.