Go for a long sleeve t-shirt and navy chinos if you want to look cool and casual without making too much effort. A pair of slip-on sneakers looks awesome here.
Long Sleeve T-Shirt with Slip-on Sneakers Smart Casual Outfits For Men
For a casually neat ensemble, consider pairing a long sleeve t-shirt with a beige linen suit — these two items fit perfectly well together. Kick up your outfit by rocking slip-on sneakers.