For a look that's nothing less than GQ-worthy, try teaming a blue check wool blazer with a navy turtleneck. You can take a more elegant approach with footwear and complement this ensemble with a pair of dark brown suede tassel loafers.
Navy Turtleneck with Blue Check Wool Blazer Outfits For Men
This combo of a blue check wool blazer and a navy turtleneck looks refined, but in a cool kind of way. And it's amazing what brown leather loafers can do for the ensemble.