Choose a navy crew-neck t-shirt and cargo pants if you want to look cool and casual without making too much effort. For something more on the classier side to complement your look, add a pair of dark green velvet loafers to the equation. So if it's a hot weather day and you want to look dapper without exerting much effort, this ensemble will do the job in no time. A practical example for any guy who's still figuring out how to dress at 40 and beyond.