Altered front, based on the medium size (which is light blue and right in the middle of the range). On the right, you can see the part of the pattern that is cut on the fold at CF and that forms the twist. I shifted the entire thing up 2 3/8" and re-trued the curve of the neckline and the lower CF seam. I've also sloped the front shoulder a small amount and added width to the side seam at the hip. The shoulder-neck, underarm, and CF-hem points remain exactly where they were on the original.
Before I tacked it together, there was a hole under the twist. I've put this in front of a lamp so it shows up. This seems likely to happen whenever the fabric is at least somewhat lightweight.