This casual pairing of a cardigan and navy jeans is a goofproof option when you need to look casually dapper but have no time. Serve a little mix-and-match magic by slipping into a pair of casual boots. As you can see here, this look proves that good style and dressing warmly for the winter months are not mutually exclusive. Rock this outfit to pull together a more mature look as a gent in his twenties.