Why not wear a white turtleneck and light blue jeans? As well as very comfortable, both items look nice when combined together. A trendy pair of grey athletic shoes is an easy way to power up this look. So as you can see here, it's a cool, not to mention spring-friendly, getup to have in your transeasonal arsenal. And if we're talking casual style for 40-something gentlemen, this look looks cool on almost anyone.