I have two other Bean sweaters that are medium and fit great. I called and was told by customer service that this sweater is 5" NARROWER IN THE CHEST than the medium in the merino wool sweater. Maybe it's just me, but I think a medium in one sweater should fit like a medium in another. And you get to spend $6.50 to send it back!
I really love the color of this and how warm it keeps me in the winter. It has a great style to it and fits well. I've been very happy with the purchase.