Consider teaming a purple dress shirt with dress pants for a sleek elegant look. This combination proves that reaching age 40 is no reason to let your sartorial standards drop.
Purple Dress Shirt with Dress Pants Cold Weather Outfits For Men After 40
Wear a purple dress shirt and dress pants and you'll be the picture of sophistication. This look is probably exactly what you're looking for as a 40-year-old gentleman.