You can find vintage shades all over the place. Take off the old cover. Sand and spray the metal frame. Wrap the horizontal top and bottom circumferences.
Wrap opposing (2) vertical struts and pin fit double thickness material beginning at one vertically wrapped strut and pin to the opposing strut.
With a chalk mark the fabric along the strut to make your pattern. Note: the material stretches if you use the weft.
What is weft? (from salvage to salvage is weft). For more stretch use the bias of the fabric.