Schott x 3sixteen A2 Jacket

[mj2936]

For those that have these, how is the sizing? The review I read said size down and the author (who is 6'0, 180 lbs but with a 39" chest) lookes best in a size small in his article.
Im 5'7", 165-168 lbs, with about a 38-39" chest. Would an XS be the size I should go for or a small?

Thanks in advance!