For a cool and casual outfit, go for a navy and white crew-neck sweater and navy jeans — these pieces work brilliantly together. Wondering how to round off this getup? Wear a pair of brogues to class it up. If you're often not sure how to dress appropriately for your age but also look stylish, this combination is a goofproof option.
A navy and white crew-neck sweater and khaki cargo pants are the kind of a tested off-duty outfit that you so awfully need when you have zero time. You could perhaps get a bit experimental on the shoe front and introduce a pair of brogues to the equation. All in all, an ideal demonstration of casual fashion for 30-year-old gentlemen.