Why not try pairing an olive pea coat with navy jeans? These items are very practical and will look awesome together. If you're hesitant about how to finish off, throw in a pair of grey suede desert boots. On not-so-chilly days, you can rock a version of this summer-to-fall getup and look absolutely awesome. This combination demonstrates that dressing maturely and looking fashionable are not mutually exclusive things for a man in his 20s.