If you're on the hunt for a casual and at the same time stylish look, dress in a navy overcoat and navy sweatpants. Finishing with a pair of white leather low top sneakers is a surefire way to infuse a hint of stylish casualness into this getup. As a man in his 30s, you probably want to start dressing like an adult. That's when getups like this are a surefire option.