If the situation allows a relaxed look, consider teaming a navy blazer with a navy v-neck t-shirt. Now that's a look any middle-aged gent will appreciate.
Navy Blazer with Navy V-neck T-shirt Outfits For Men After 40
Master the effortlessly smart look in a navy blazer and a navy v-neck t-shirt. Give a more refined twist to your ensemble by sporting a pair of black leather double monks. A proper pairing for any gent in his forties.