As you can see here, looking seriously stylish doesn't take that much effort. Just consider teaming a sweater vest with white chinos and you'll look awesome. You could perhaps get a little creative on the shoe front and introduce a pair of black work boots to your outfit.
Black Work Boots with Sweater Vest Outfits For Men
If the dress code calls for an effortlessly classic outfit, choose a sweater vest and khaki chinos. Infuse a hint of stylish casualness into this outfit by slipping into a pair of black work boots.