Consider wearing an olive camouflage shirt jacket and a white short sleeve shirt if you wish to look casually cool without putting in too much effort. As for the shoes, you could go down the casual route with a pair of white canvas low top sneakers. Keep this getup ready to go when warmer days are here, and rest assured, you'll save time trying to pick out what to wear on more than one occasion. Relaxed casual outfits for gents in their 60s aren't actually that hard, as you see here.