Why not go for a grey overcoat and a white crew-neck t-shirt? As well as totally comfortable, these two items look awesome combined together. Navy low top sneakers will give a more casual finish to an otherwise sober outfit. Casual looks for gentlemen in their thirties aren't actually that hard, as you see.
Effortlessly blurring the line between sharp and laid-back, this combo of a grey overcoat and a white crew-neck t-shirt will easily become one of your favorites. Tan suede work boots can easily tone down an all-too-dressy ensemble. Those who wonder how to pull off modern off-duty looks as you pass the big three-oh, this combo should answer your question.
A grey overcoat and a white crew-neck t-shirt teamed together are a nice match. A good pair of dark brown leather casual boots pulls this outfit together. All in all, smart casual and mature enough.