I broke down and ordered the Ibex Cortina loden wool vest in apple green:
http://www.ibex.com/Photos/F06/208_2722.jpg
It's on sale:
http://www.ibexwear.com/shop/Product...t=Cortina-Vest
I find that wearing a couple of wool longsleeve tops and then just a heavy vest over them is really nice for being outside in about 30 degrees. I don't overheat because the air can circulate a bit around my arms, but the vest keeps my core very warm. And I can move freely- great for fitness walking.

As long as my core, head&neck, hands, and feet are warm, I usually feel ok with a bit less on my arms and legs.