The styling capabilities of a light blue crew-neck sweater and black chinos ensure they'll always be on regular rotation. Finishing off with casual boots is the most effective way to breathe a hint of refinement into your look. This one is a stylish and age-appropriate combo for young guys.
A light blue crew-neck sweater looks especially great when teamed with olive jeans. And if you wish to immediately dress up your ensemble with a pair of shoes, introduce a pair of casual boots to the equation. As a 30-year-old gent, you probably want to start dressing more like a mature gentleman. If that's the case, combos like this are a goofproof option.