Marry a sweater vest with a white crew-neck t-shirt to assemble a dressy, but not too dressy ensemble. And if you want to immediately rev up your look with a pair of shoes, introduce a pair of brown leather chelsea boots to the mix. A fail-safe option combination proper for mature gentlemen.
For an ensemble that's city-style-worthy and casually classic, marry a sweater vest with a white crew-neck t-shirt. Dark brown fringe leather loafers are the simplest way to infuse an added dose of refinement into this outfit. So as you can see this getup is something you can totally wear as a 40-year-old gent.