I started by cutting out my suedecloth for the pocket diaper inner. Then, about 3 inches from the top/back, I cut a 5" long slit right in the middle, and then little angled slits out from the ends so that when folded back there would be a small rectangular opening. I took some photos of this process on scrap white fabric with black marker showing folds, cutting, and sewing lines so it is easier to see. I then cut out two 7"x 3" rectangles and folded them in half length-wise.
Here they are pinned to the back of the opening of the inner suedecloth:
This photo shows the back side:
I did a tight zig-zag stitch around the edges to sew the folded pieces onto the inner fabric:
I then trimmed off all the excess fabric from the back side to leave this clean pocket opening:
Here are my inner and outer fabrics all prepared and pinned together ready to sew:
Sewn together faces-in and corners trimmed ready to invert through the pocket:
Turned right-side-out and top-stitched (for ruffled elastic casings):
Casing channels sewn:
Close up of the casing channel for ruffled elastic:
Shown with the elastic threaded:
Finished outer (I made this one a 3x3 rise):
Finished pocket inner without insert:
Insert stuffed:
You can print or download any of my templates linked here: http://prefold2fitted.blogspot.com/2012/10/online-free-downloads.html