You're looking at the definitive proof that a navy cardigan and black vertical striped dress pants are amazing when matched together in a polished ensemble for a modern man. A nice pair of black leather loafers is an easy way to infuse an added touch of refinement into this ensemble. As a gent in his 30s, you probably want to start dressing maturely. If that's the case, outfits like this prove useful as a source of inspiration.