If you like off-duty style, why not team a white print crew-neck sweater with a light blue long sleeve shirt? Finishing with red and white athletic shoes is an effortless way to inject an air of stylish effortlessness into your look. A cool outfit that will take you from summer to fall like this one makes it extremely easy to embrace the new season. And if we're talking casual dressing ideas for gents over 40, this ensemble is perfect.