White shadow shibori is one of the difficult shape resist techniques. It is tough to get the balance of the shapes and sizes right so the indigo does not bleed in from behind and ruin the perfect white background. She got it perfect on her last masterpiece.
First the pattern was drawn on the cotton and then painstakingly stitched and stitched. (Muriel has done some haute couture embroidery in France and knows what slow progress is all about.)