This sophisticated combination of a beige sweater vest and grey dress pants is a common choice among the dapper gents. Finishing off with white athletic shoes is a fail-safe way to infuse a playful feel into this outfit. So as you can see, it's very easy to look stylish and stay comfortable come colder days, thanks to this getup. Overall, a foolproof choice when it comes to dressing ideas for gents in their thirties.