If you enjoy practical style, consider pairing a black blazer with a white and pink print crew-neck t-shirt. To give this look a more relaxed twist, complement your outfit with black and white canvas low top sneakers. Clearly, it's easier to work through a warm warm weather afternoon in a breezy look such as this one. Gentlemen who are curious how to wear modern casual dressing as you move into your 30s, you have your answer.