If you're a fan of off-duty style, why not take this pairing of a white shirt jacket and a dark green crew-neck t-shirt for a walk? And if you want to immediately dress down this getup with a pair of shoes, go for black and white canvas high top sneakers. So if you're on the lookout for a neat look that transitions easily into spring, this one is great. Gents who are curious how to wear modern casual looks well into your 30s, you have your answer.