Channel your inner Bond and pair a navy waistcoat with navy dress pants. For something more on the cool and laid-back side to finish your outfit, complement your outfit with black leather double monks.
Navy Waistcoat with Black Leather Double Monks Outfits
This combo of a navy waistcoat and navy chinos is the definition of manly elegance. If in doubt as to the footwear, go with a pair of black leather double monks.