For a look that's worthy of a modern style-savvy man and effortlessly smart, wear a navy dress shirt with beige cargo pants. Casual boots are the glue that will pull this ensemble together. In the colder months, when comfort is everything, it can be easy to surrender to a less-than-stylish ensemble. However, this ensemble is a stark illustration that you can actually stay toasty and remain equally stylish in the colder months. A perfect combination as you shift into the next decade of your adulthood, your 30s.