There are a few great ways to work this look. One is to replace a suit vest with a V neck cardigan as in this picture for Thom Browne. Its a little unexpected. This look is more common with trousers and a sport coat, so wearing it with a suit makes for a unique pairing.
For a simpler take, wear your basic crew or V neck sweater under your jacket. Its an easy no-brainer ensemble that works well in a nice business casual environment. You can even add a quality white tee under the sweater for a more layered look (and added warmth) as John Hamm shows here.
Work in a collar and tie environment? Joseph Guardiola shows just how dapper this look can be!
And, if you read our September series featuring the hottest trends of the season, then you already know that a turtleneck sweater will be THE way to wear this look right now!