I’ve had this for the last year or so, really nice sweater! I’m 5’ 10” 171#, and the large fits nice and trim. Enough room for a t shirt and flannel underneath. Quality wool has a wide temperature range.
I buy from Bean often, usually because their shirts are indestructible. Years ago I owned a sweater like this so was pleased to see it available again, HOWEVER, NOTE: The sizing is much smaller than the advertisement would suggest. I purchased an X-Large, Tall and I can hardly get in or out of it. Will likely just donate it to charity as return shipping would not recover the larger part of my costs.
For this item I would recommend going 1 size larger.