The jacket is very nice but DO NOT order to match the small - medium - large - x-large you might currently wear.
However, I think the Jacket sizing chart is incorrect. What they label "chest width (circumference)" is not your chest circumference (mine is 39 in). It's really the circumference around your shoulders (mine, 47 in).
When I shop a store for a Jacket I look in medium to large. In their chart 47" is between Large and X-Large. I got an X-Large!! It's a little snug but it's wearable.
Also, it can take a couple of months to get your order, so order NOW for next fall/winter