This combo of a trenchcoat and a purple crew-neck sweater is a goofproof option when you need to look effortlessly sleek in a flash. Finish this getup with a pair of black and white athletic shoes for a fashionable on and off-duty mix. On not-so-bone-chilling afternoons, wear a variation of this transitional outfit and look absolutely amazing. Ideal if you're looking for some seriously inspiring style for 30-something gentlemen.