If you're facing a sartorial situation where comfort is the priority, this combination of a white long sleeve t-shirt and cargo pants is always a winner. You know how to play it down: white sneakers. This outfit shows how 30-something guys wow in the style department.
Marry a black crew-neck t-shirt with cargo pants for relaxed dressing with an urban take. Give a more informal twist to an otherwise standard getup by sporting a pair of white sneakers. All in all, an ideal demonstration of casual style for 30-something Millennial gents.