This pairing of a mint shirt jacket and navy chinos is a lifesaver when you need to look casually sleek in a flash. Play down the casualness of your ensemble by slipping into a pair of navy leather tassel loafers. When you have one of those gloomy autumn days, sometimes only a killer getup like this one can cheer it up. A practical example for anyone who's not sure how to dress maturely as a guy in his 30s.