This pairing of a brown cardigan and navy chinos is a must-try smart casual getup for today's gent. Want to go all out when it comes to footwear? Complete your ensemble with a pair of dark brown leather brogues. So so as you can see, it's a neat, not to mention spring-friendly, look to keep in your seasonal wardrobe. As a 30-year-old guy, you want to start dressing maturely. If that's the case, outfits like this prove useful as a source of inspiration.