A navy crew-neck sweater and white chinos are a cool ensemble that will effortlessly take you throughout the day. For something more on the daring side to finish off this look, introduce navy athletic shoes to this look. Keep this look in your front hall closet come warmer days, and we promise you'll save a lot of time getting ready on more than one morning. This combination is probably exactly what you've been looking for as a man in his thirties.