A blue crew-neck sweater and a crew-neck t-shirt will give off this cool and casual vibe. For something more on the casually cool side to complete your ensemble, complete this look with a pair of black athletic shoes. Keep this getup in your front hall closet come warmer days, and we promise you'll save a ton of time getting ready on more than one occasion. Think you can't pull off modern off-duty dressing as you slip into your 60s? This pairing should prove you wrong.