Anyone know if there is a science to grading the pintuck portion of a pattern? I'm having to grade this pattern up quite a few sizes and have picked a heck of a pattern to practice my grading on. It is a bust size of 34", I'm taking it to 43". I know I'm gonna have to add a buttonhole or two in the end. I may even have to add a tuck in there. Just looking for tips and tricks.