What size b70 nero to get?

Hmm, for the blueseventy high neck nero, what size should i get? I am pretty skinny, 6"2 and 140 lbs. All the size charts tell me to get sizes based on my height and weight, but the problem is, they never have my size and wieght together. Either someone who weighs 125-160 is about 5"5, or the weight for 6"2 is usually 190-200 lbs. So help me, what size should i get?