Could be. It doesn't help that it's now a tad too tight at exactly that point of the torso where the top button falls, which draws attention to that part of the fit. I'm a bit bigger there then I was when I first got the suit about seven years ago. Back then there was no buttoning crease to be seen.
Getting this right with a three-piece is not all that easy, since in addition to all the usual considerations one needs to take into account the button stance of the waistcoat.