For a casually stylish ensemble, consider teaming a tan trenchcoat with a blue denim shirt — these two items fit really well together. Rounding off with white leather low top sneakers is the most effective way to bring a carefree touch to this ensemble. When temps are dropping and autumn is in full swing, you'll love this outfit as your favorite for transitional weather. A nice getup to demonstrate the world your maturity even as a gent in his 20s.