You can find the pattern free on Ravelry if you'd like to give it a whirl. I found the schematic easy to follow, which I wasn't expecting 'easy' since the pattern was originally in Japanese. The version you can link to has been translated to English, but you must follow the pattern diagram in order to read the pattern since the crochet stitches aren't written out.
If you need help with understanding what the symbols mean in the diagram go here.
The hardest part for me was sewing the interior portion of the case, then hand stitching it to the crocheted exterior. As you can see by my irregular whip stitches, it was hard for me to keep a consistent sized stitch going. I think all of the difficulty is mostly due to my choice of fabric, which was pretty thick. I chose a thicker fabric, almost comparable to canvas, so that the case would be a bit on the tougher side. I tote my hooks around a lot and was afraid if I made it too delicate the case wouldn't last very long. If you pick a soft cotton or more pliable fabric it will probably be a lot easier to attach to the crocheted piece.
If you're looking for a new project you may want to consider this one. I highly recommend it!
