Two questions about the Fisherman Round Neck Crewneck: First, from this current season, what would be the best sizing be for someone with a 40 to 41 inch chest? I want the fit to be trim, not ultra fitted, but not slouchy either. Secondly, what is the weight of the sweater? Would it be unbearable walking around 70+ degree weather? I know the Trope sweater is lighter, but having tried another mixed cotton/merino creation of SNS's, I find I much prefer the substantial feel of the winter knits. My Paragon jumper is both substantial and yet comfortable, because the bars of the stitching lets the entire sweater breathe. I hope I can re-create that if I buy the roundneck. What's the recommendation?