A white knit shawl-neck sweater and charcoal jeans are the kind of a never-failing casual combination that you need when you have no time to dress up. To bring a little fanciness to your ensemble, complete your look with a pair of brogue boots. If you're hunting for a cool look that transitions easily into spring, this is it. Overall, a savvy pick when it comes to dressing ideas for men in their thirties.