Depending on the temps you can use this Nike Military Vest as a top or mid layer. When it's a bit chilly out, chuck it over a long sleeve tee and keep you core warm. If it's getting proper cold then throw it underneath a shell to add some insulation to your fit.
Onion quilted stitching holds synthetic insulation in place for a classic military look, whilst the side pockets allow your hands somewhere to hide when they're getting a bit cold. If someone asks you what the brand is, you can always point to the embroidered Swoosh on the chest if you're feeling particularly obnoxious.