For a cool and casual getup, marry a black crew-neck t-shirt with blue jeans — these two pieces fit pretty good together. You could stick to a more elegant route with shoes by finishing off with dark brown leather casual boots. This look is a fail-safe option if you're hunting for a great, season-appropriate look. When it comes to casual outfit ideas for over-40 men, this ensemble is ideal.
If you gravitate towards relaxed casual looks, why not take this combo of a white crew-neck t-shirt and blue jeans for a walk? If you feel like dialing it up a bit, add a pair of dark brown leather casual boots to the equation. No doubt, it's easier to work through an extremely hot summertime day in a summery combination like this one. A safe bet getup appropriate for 40-year-old gents who like casual dressing.