Go for a pared down yet casually dapper look by combining a navy wool turtleneck and black chinos. Balance out your look with a more casual kind of footwear, like these white canvas low top sneakers. Keep this combo in mind come warmer weather, and we promise you'll save a ton of time brainstorming for what to wear on more than one occasion. And if we're talking casual style for 30-year-old guys, this ensemble is ideal.