I recently discovered this brand and will give them a shot and had a few questions about sizing. I looked through the thread a bit and couldn't find the info I needed so hopefully someone can help me out.
I'm 150lbs, 5'11. About 37 inch chest.
In J.Crew - I wear most of their shirts in size small, slim. The back is a bit balloon-y. The shoulders and chest are good.
In Brooks Brothers Extra Slim Fit - I wear 15/33. The shoulders and chest are excellent...