The next fold is characterized by having two points of origin. It is called the diaper fold because it has the look of a diaper hanging on a clothes line. The image below clearly shows
the basic configuration.
The next illustration show both the pipe and diaper folds. Notice how the folds go over the form. We have a clear understanding of the volume of the legs, waist, and even the arm as the drapery goes behind and over it.
By Glenn Vilppu
This article was taken from the Drawing Drapery Manual.