You'll be surprised at how extremely easy it is for any gentleman to put together this casually neat look. Just a brown puffer jacket and a crew-neck sweater. And if you want to immediately dial down your look with one single piece, complement this ensemble with white canvas low top sneakers. As you're transitioning from your 20s to your 30s, you probably want to start dressing like a grown man. In this case, getups like this prove useful as a source of inspiration.