A military jacket and a crew-neck t-shirt married together are a match made in heaven for those who love neat and relaxed styles. And if you wish to immediately dial down your look with footwear, why not complete this getup with a pair of black athletic shoes? You're sure to always look stylish even despite the summer heat if you keep this ensemble in your front hall closet. This outfit illustrates how to keep slaying in the casual style department as an over-40 gentleman.