This little London shade illustrates how there are no absolute rules about window treatment fabrication.
Every treatment is an expression of the numeric relationship between treatment measurements, design components, fabric width, and vertical and horizontal pattern repeats.
Obviously the pattern had to be centered on the treatment, and needed to
match at the pleats. There were two widths of fabric available, but if
it was seamed the normal way, i.e. split a width and piece half on each
side of the full width, there would have been seams in the front of the