Dress in a double breasted blazer and brown chinos if you're aiming for a proper, stylish ensemble. If you want to instantly play down this getup with one single piece, why not complete your look with a pair of black and white slip-on sneakers? As you can see here, this getup is a really nice idea, especially for transitional weather, when the temperature is dropping. This combination demonstrates that in your 40s your dressing options are looking good.