It is a problem if it is not the look you like. To some it is a stylistic preference. Assuming these are both cut with side bodies the work would be done on the seam that extends fro the front pocket to the hem. Along the seam that joins the side body to the fronts. The jacket would be taken in on the front only or the side body only or equally from both. I would look at the grain line to know which is best and how much to reduce. This is the easiest fix. Not a big job.