For a modern take on men's formal wear, have your groom skip the bow tie and rental tuxedo, and opt instead for a classic, single-breasted black suit and tie. Finish off with a crisp white dress shirt, cap-toe leather oxfords, suspenders, smoky onyx cuff links, and a pocket square, and, voila , the perfect wedding attire. And with just a few adjustments (nix the pocket square and the cuff links), presto, his outfit is transformed into one that he can wear to parties -- even to other weddings at any time of day. 

Evening suit, Paul Smith London, $1,500. Henry shoes, Church's Royal Collection, $855. Formal hose, $35, and dress shirt, $79.50, Brooks Brothers. Cuff links, Barneys New York, $375. French-cut grosgrain braces, Bergdorf Goodman, $225. Pocket square, Paul Stuart, $49.50. Silk tie, Paul Smith Accessories, $135.