If you have trouble getting those layers just right then these vests should come in very useful to you. Easy to get on and easy to take off should there be a sudden change in weather and temperature and with the express purpose of keeping you warm, a vest is a handy alternative to a heavy jacket, providing more manoeuvrability and breathability. You'll find a wide range here from light, mid and heavyweight, each providing different kinds of protection to the last so make sure you check out the specs!
The North Face Men's Thermoball Vest NF00C763
The North Face Men's Nupste Vest NF00C760
The North Face Men's Patricks Point Vest NF00CYK2
The North Face Men's Kilowatt Thermoball Vest NF0A2TGF