This is how I recovered a plain white lampshade I had from IKEA. I make NO promises on how yours will turn out or how it will work for you, but these are the steps I took and the materials I used. I hope this helps and that you have success!
Recovering a lampshade is a simple way to add one more matching element to your decor. Sometimes you have a lampshade you hate and is hideous or sometimes (and for me a lot of times) you change things up and now your lmap no longer matches. You can use leftover fabric from pillows or other projects to make these. Experiment with different ribbons or other embellishments and just have fun. Nothing is so wonderful as something you did all by your lonesome!
1. Starting at the seam of your lampshade roll it on your fabric until you reach the seam again marking on the wrong side of your fabric first the top and then the bottom. Cut out making sure you have a one inch margin on both top and bottom and a one inch margin on one side.Protect your work surface with newspaper or whatever else (I used a large kitchen garbage bag).
I did use hot glue (gluing at the top and the bottom) to glue four strips of ribbon along my lampshade for some added interest. This step is purely optional, but I quite like the way it turned out.