Marrying a navy trenchcoat with a dark brown blazer is a great option for a smart and refined ensemble. Break up your ensemble with a more laid-back kind of shoes, like this pair of black suede snow boots. When temps are dropping and autumn is in the air, you'll appreciate how great this ensemble is for summer-to-fall weather. As you're transitioning from your 20s to your 30s, you want to start dressing like an adult man. That's when inspo like this comes in very handy.