For an outfit that's very simple but can be styled in a myriad of different ways, consider wearing a white dress shirt and beige chinos. For something more on the smart end to complete your outfit, add black leather loafers to your ensemble. When temps are getting lower and fall is in the air, you'll love this combo as your go-to for summer-to-fall weather. This is a nice but also age-appropriate outfit for a guy in his forties.