An olive long sleeve t-shirt and chinos are wonderful menswear essentials that will integrate really well within your current routine. Want to go easy in the shoe department? Introduce a pair of white athletic shoes to this ensemble for the day. So as you can see, it's an on-trend, not to mention spring-ready, look to have in your seasonal wardrobe. This pairing should clear any doubts you had about dressing casually as a 30-year-old gentleman.