Smocked Button-Down Sundress

This dress is beautiful. It’s a great bright color and the smocking at the top is beautiful as well. Very flowy and comfortable. Unfortunately, there’s a weird pucker / gap that is pulling at the top button. You can see it when looking closely of the photo of the model. I am about 5’5, 118 -120 pounds, long torso, small chest and normally a size small. I sized up to a medium as I tend to do with smocked tops for added comfort and stretch (I also have broad shoulders). I’m tempted to try a large but not sure that would do the trick. It’s really too bad!