I'm 5ft 10", 155lbs and went up a size based on the size chart. I chose based on chest size. I'm a road cyclist so I'm used to tight fitting cycling gear and I'd say it fits pretty well. It's not a tight body fit, but I think the medium might have cut it too tight. Overall I think the big one will work and allow some movement without flapping in the wind. I think bike brands (Pearl Izumi, Castelli, Endura) of similar quality would easily cost $20-$30 more. I will mainly use it on cool spring days to keep warm.
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