I read the reviews and was advised to order a size up, I usually wear XL or XXL but ordered XXXL, soo glad I did. It fits well I just need to adjust the length an inch or so.
Update-
Wore it for a few hours yesterday and now regret sizing up two sizes. After the first hour in the jeans I can now wriggle out of it without unbuttoning or unzipping.  Only size up one size. I has a lot of stretch to it.