Is it at all posisble to extent her waistline at the bottom so that it goes out to the lower right and left corners of the torso? That way it would look better when you attach her to legs or a slope brick.
I am sure it would be possible, but I don't think it would even be necessary. If you look closely, the legs do not actually extend all the way to the edge of the torso. The legs line up with the bodice as is..
This is not the case with the slope brick dress, so a change would need to be made for it to match in that scenario. But wouldn't it then seem as if the lovely maiden had already bore a few children