I own two of these jackets one is an older version and one is the new version in Lipstick and they are identical jackets, just different colors every year. I am 5'7" 135lbs medium frame 32D normally wear a size 8/10 and I got this jacket in large to accommodate my long ape arms and layering. The jacket has plenty of stretch, but don't anticipate wearing a helmet under it as the hood is quite small and fitted (with an adjustment toggle to tighten even). This jacket has a flattering cut and very convenient zipper pockets. It is VERY breathable and water resistant. Great 3 season layering piece. Lot's of compliments on the hot pink "Lipstick" color!