For a casually polished ensemble, consider teaming a black polo neck sweater with blue jeans — these two items play pretty good together. White canvas low top sneakers will bring a more casual vibe to an otherwise all-too-safe outfit. So if you're on the hunt for an ensemble that's dapper but also totally season-appropriate, this one fits the bill. That's the style for a 30-year-old gent to project you've got what it takes to succeed.