Try pairing a white crew-neck t-shirt with brown chinos to demonstrate you've got serious styling prowess. If you're hesitant about how to finish, introduce a pair of white canvas low top sneakers to your ensemble. Laid-back ensembles for stylish over-40 gentlemen aren't actually that hard, as you see here.
You'll be surprised at how super easy it is for any gent to get dressed this way. Just a white crew-neck t-shirt and brown chinos. Channel your inner David Gandy and elevate your ensemble with a pair of brown leather casual boots. This combo demonstrates that staying fashionable in your 40s is not that daunting a task.