I'm thinking about picking up a thermawrap vest. I own an UL down inner in a size medium. It has a trim fit but is not restrictive. I have read a number of post indicating that the thermawrap vest fits much tighter. I'd really like to be able to wear the vest under the jacket. I'm almost 5'10" and weight 156 lbs. Any thoughts if a medium in the vest will work for me or do I need a large.
Thanks for any advice.
Jamie
PS Here is a pick of me in the down inner.

