A grey denim shirt and light blue jeans are a good pairing that will effortlessly carry you throughout the day and into the night. Send an otherwise traditional ensemble a more informal path with a pair of white athletic shoes. You know when it's baking hot outside, sometimes only a light and breezy outfit like this one can get you through the day. Those who are dubious whether you can still wear modern off-duty dressing after 40, you have your answer.