Things you'll need:
-Tablet or e-reader to put into it and for the meassurements
-piece of soft leather (the piece I have is normally used for furniture, one side is grain the other is sued)
-good sewing machine
-some gear wheels or other decorations
-sewing material: needle, strong pins, thread, scissors and so on.
Step 1: Measurements
I have a Samsung Galaxy tab S 8.4. I took the measurements with the cover so it will fit in both ways and they were 21.5cm x 13.0cm x 1.2 cm. Add some extra centimeters so it fits in easily and for the seam allowance. The grey parts on the pattern will be the folded seam.
Step 2: Cutting the Pieces
Put your templates on the leather, mark the outlines and cut out the pieces.
Step 3: Sew on the Gear Wheeles
Step 4: Sew the Seams
Fold a 3 cm seam on one end of the pocket piece and fix it too.
On the other end of the pocket piece you put the application piece. It has a margin of 2 cm on each side. This margin will make it a less hard to sew the corners in the end.
Now sew all the seams. If you have a blind seam foot it's much easier to keep the same distance. Sew around the application piece the same way. You don't need to sew the bottom, as ths side will be sewed together, when the pocket is sewed on the main piece.
Step 5: Sew on the Pocket
Sew on the pocket on the sides. You will get a loose sleeve.
Step 6: Sew the Case Together
Step 7: Sew the Bottom of the Pocket
Double fold the corners of the pocket on both sides in to an S-shape. The application and the main piece will be flush. Fix it with pins and sew the last side of the pocket to the case.
Step 8: Add a Button
Sew on the button.