For an outfit that brings practicality and fashion, wear a white gilet with dark green chinos. And if you need to effortlessly play down this ensemble with one single piece, why not introduce a pair of low top sneakers to the equation? When it's one of those dull fall days, sometimes only a neat getup like this one can get you out the door in the morning. And if we're talking fashion tips for gentlemen in their 30s, this look is ideal.