Wear a navy cable sweater with black dress pants to have all eyes on you. You can take a more casual approach with footwear and complete your look with a pair of black leather casual boots. Keep this combo ready to go come warmer weather, and rest assured, you'll save a lot of time trying to pick out a look on more than one occasion. This outfit is the perfect answer to the question of how to dress age-appropriately in your 30s.