Beautiful vision! Considering your artistic abilities (Amazingly gifted), have you thought about painting your fabrics by hand to achieve the look you want? There are many good fabric paints out there, liquids, pens, inks....I'm visualizing an approximate 12"x12" piece of white or colored background fabric would give you the amount of fabric you need for each dress. You could replicate a design to scale. Someone mentioned silk, oh my, that would be beautiful! Please keep us appraised as you create.