Judging from comments to the first entry, it is not universally understood that girth increases will require length increases in a grade. So, I made up one dress (1/4″ woven gingham) and put it on both balls to provide a comparison. Below is a small version, see the larger file if desired. The black marks indicate 1″.
It is not readily apparent owing to depth of field and differing positions when I took the photos but the hemline on the soccer ball is over 2″ shorter than that of the football. Again (as this seems to be a point of confusion, this is the same dress on both balls. The photo above shows the two balls side by side to provide comparison but the photos were taken separately and then spliced into one.
Renee mentions that length increases vary based on relative position of the garment striking the body (or not). To illustrate this point, I thank Carol Kimball who sent me a file which I’ve amended like so:
Waist to hip: In that figure A is more slender than figure B, the side seam length of figure A from waist to hip is shorter in total length than the side seam length of figure B. This means that for today’s styling, grading for an increase in girth also requires a length adjustment from waist to the hip line for the various sizes.
Hip to hem: While it is also true that the side seam length of Figure A is shorter than Figure B from hip to hem, whether a length adjustment is needed is based on silhouette. For free flowing skirts, the hip to hem length is static for figures of identical height. However, if the garment tapers or is cut snugly to the figure, the hip to hem side seam length will also require adjustment.