The explanation does not include size so that you can adapt this idea to any device you want to cover.
First I went around the Kindle with a pencil held straight vertically, to have a pattern . Then I added 3/4" in width and length, to allow for the seam allowance and the volume of the fabric and wadding all around. I can tell you that it fitted snugly.
Here you can see my 2 paper patterns. I added a little flap at the top, to attach the Velcro for the closure.
You will put the outside parts right sides together, pin them, and do the same with the lining parts, leaving a gap on the side or the bottom to turn everything out. Follow the curves with your sewing machine.
The tricky bit is the middle. You might need to finish that by hand to have a very neat result, or try it by machine.
So here we are.
I am happy that I don't need to buy the sleeves offered in shops. They are all the same, overpriced and not original for a penny.
And I am proud that my work is deemed worth it by my family. Love it.
Now it's your turn.