For a laid-back look, consider pairing a grey turtleneck with a navy plaid long sleeve shirt — these pieces play pretty good together. Take this look in a more relaxed direction by rocking white canvas low top sneakers. As the weather starts to warm up, it's time to shed those heavy winter clothes and opt for an ensemble that's lighter, like this one here. Gents wondering how to rock modern casual dressing as you step into your 30s, you have your answer.