A yellow crew-neck t-shirt and black jeans are a combination that every modern gentleman should have in his casual sartorial collection. To give your ensemble a more laid-back finish, why not add a pair of orange canvas high top sneakers to the mix? So if it's a blazing hot summer day and you want to look dapper without exerting much effort, this outfit will do the job in no time. Those who are curious how to dress well after 40, you have your answer.