And by "google", I mean do that and then flip through pattern books at the library. Then start the project when you don't actually have the Kindle with you.
If I've learned anything from this experience, it's that you should not try to make Kate's Kindle Kozy without the Kindle. Having the Kindle is a key step to not completely screwing up the size. Even having the Kindle is not necessarily helpful since I think I had to start this thing 3 or 4 times.
As you can see, I also learned that there are only three buttons in the house, and they're all terrible. Lion Brand claims it's possible to crochet a button, but I assume that pattern is a leftover April's Fools joke that someone forgot to take down.