For a laid-back and cool outfit, go for a cardigan and khaki cargo pants — these two pieces fit really good together. If you need to instantly lift up your ensemble with footwear, add brown casual boots to the equation. Can you see how very easy it is to look seriously stylish and stay warm come chillier days, all thanks to getups like this? When it comes to casual outfit ideas for mature guys, this getup is a good look on most gentlemen.