Petite, regular and long torso. Every page gives a verdict first, then the fit rule, then the size. Some say no; those are the pages that make the rest believable.
Shapewear for a long torsoLengthen the straps. They are fully adjustable; set them until the hook-and-eye crotch closure sits comfortably and the waist panel is at your natural waist. If the longest setting still pulls, go up a band, whatever the chart says.
Shapewear for a short (petite) torsoShorten the straps; they are fully adjustable. Stop when the waist panel sits at your natural waist, not the ribs, and the hook-and-eye crotch closure is comfortable. Keep your bust-and-waist size; do not size down to fix torso length.