The combination of a beige henley shirt and dark brown chinos makes for a knockout off-duty menswear style. Take this ensemble down a more casual path by rounding off with high top sneakers. Needless to say, it's easier to work through a warm summer afternoon in a easy and breezy getup like this one. As you can see here, in your 40s your sartorial options are far from limited.
You're looking at the definitive proof that a navy crew-neck t-shirt and dark brown chinos look amazing when married together in a relaxed casual look. A pair of high top sneakers will add an easy-going touch to this ensemble. As this look suggests, you can't think of a better pick for warm weather. Those who are dubious whether you can still wear cool casual outfits as you head into your 40s, this getup should answer your question.