This casual combination of a white crew-neck t-shirt and navy sweatpants is very easy to pull together in next to no time, helping you look seriously stylish and ready for anything without spending a ton of time going through your closet. For a classier touch, add white canvas low top sneakers to the mix. So as you can see, it's very easy to look seriously stylish and stay cozy when cooler weather hits, thanks to this ensemble. All in all, a great example of casual style for 50-something gentlemen.