Putting together a navy puffer coat and a crew-neck sweater will be definitive proof of your prowess in menswear styling even on dress-down days. Complement this look with a pair of black leather derby shoes for an air of class. Keep this getup ready to go when spring arrives, and we guarantee you'll save a lot of time getting dressed on more than one morning. Wondering how to master semi-casual outfits as you cruise through your 20s? This pairing is a practical illustration.