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!
Royal Robbins Men's Field Guide Vest 40027
Carhartt, Inc. Men's Quick Duck Jefferson Vest 101494
Woolrich Men's Bear Claw Vest 18070
Patagonia Men's Better Sweater Vest 25881
$84.99 - $89.99
Woolrich Men's Utility #12 Vest 18409
Columbia Sportswear Men's Silver Ridge Vest 1441721