Go for a straightforward but at the same time casual and cool outfit putting together a white crew-neck t-shirt and olive cargo pants. White leather low top sneakers look very fitting here. This one is an exciting option when it comes to a cool look that will take you from summer to fall. This is a pairing you, as a guy in his forties, can always rely on.
You'll be amazed at how easy it is for any gentleman to get dressed this way. Just a white crew-neck t-shirt and olive cargo pants. Loosen things up and complete your getup with a pair of grey athletic shoes. On not so cold afternoons, wear a variation of this transitional getup and look absolutely awesome. This outfit should erase any doubts you had about wearing casual clothes as a man in his forties.