Consider pairing a navy blazer with aquamarine chinos to look elegant but not particularly formal. To bring some extra definition to this look, complement your getup with a pair of tassel loafers. When it's one of those bleak autumn afternoons, what better to spice it up than a sharp look like this one? A good illustration for any gent who's still working out how to dress maturely as a 30-something Millennial man.