chouyatouMen's Mid-Length Single Breasted Wool Blend Top Coat

I’m 5’9 and about 120 pounds, would a small be best recommended or an extra small?

I'm 5'2 and 98lbs, would a XS fit or would it be too big?

I’m 5’6” and about 140 lbs and fit, would the xs or the small be better for a fitted look?

I am 5‘11, 150 pounds, skinny with a flat chest. I also have really long arms. What size should I get?