This casual combination of a navy long sleeve t-shirt and navy jeans is capable of taking on different nuances depending on the way it's styled. If you wish to effortlessly lift up your ensemble with a pair of shoes, why not add a pair of dark brown leather desert boots to the mix? Seeing as temperatures are dipping, this look is a nice idea for the season. And if we're talking casual fashion tips for gentlemen over 50, this ensemble is ideal.