As you can see here, looking dapper doesn't require that much effort. Just rock a charcoal wool blazer with a dark green turtleneck and be sure you'll look awesome.
Dark Green Turtleneck with Charcoal Wool Blazer Outfits For Men
A charcoal wool blazer and a dark green turtleneck are absolute staples if you're putting together a refined wardrobe that holds to the highest sartorial standards. Finish with a pair of olive suede chelsea boots to power up this getup.