This combination of a tan plaid long sleeve shirt and a white crew-neck t-shirt is the perfect base for a laid-back and cool outfit. Complete this look with a pair of tan canvas low top sneakers et voila, the ensemble is complete. Undoubtedly, it's easier to work through a warm summertime day in a light and breezy look like this one. This getup demonstrates how to keep killing it in casual dressing as a gentleman in his 30s.