I don’t have enough spare fabric to redo any wall if I mess up the windows so I’m using scraps to practice on. The image shows four different colours of nylon organza because until the frames are embroidered, I can’t tell which colour might be best for the window panes.
The book says to trace the windows onto applique paper and fuse the organza to the ground fabric with it. I was loath to buy a pack of applique paper as I can’t see me ever using it again so my substitute was Heat n Bond Lite. This means I had to draw the window guidelines directly onto the organza itself but a pencil for the lighter three and a UniPin fine liner for the darkest organza seem to show up well enough.