Putting together a red cardigan with grey sweatpants is a nice choice for a relaxed casual getup. The whole outfit comes together perfectly when you add a pair of low top sneakers to the equation. Keep this outfit in your head come warmer weather, and we promise you'll save time racking your brain for what to wear on more than one occasion. This pairing should prompt anyone who had doubts about donning casual outfits as a man in his fifties.