For a casually sophisticated ensemble, reach for a dark brown double breasted blazer and chinos — these two pieces fit really well together. To give this look a smarter aesthetic, complement this look with a pair of dress boots. Keep this combo in mind come warmer weather, and rest assured, you'll save a lot of time getting dressed on more than one occasion. All in all, a winning option if we're talking fashion tips for 30-year-old gentlemen.