It really fits all the way around so I wouldn’t worry about it, it might be that I’m biased to like the straight rear on this particular jacket style. But the front of the straight hem definitely doesn’t fit as well as the left which fits your midsection might trimmer. You can factor in whether you will wear this more open or closed and see how it looks.
If I had to choose I'd pick right and pull my pants up a bit. Ultimately, neither fits you ideally, but we all suffer that same pain in some way, either through appearance or the sensation of fit. What you can tolerate is up to you.