I whipped this up so fast! I cut the fabric on my way downstairs to sew the last few stitches on the construction playmat. Then I went and finished the top stitching on the playmat, and zipped up the back for the pillow and right sides together, zip around, zig zag around for reinforcement, turn and voila pillow case!
This time I learned that the back pocket part of the pillow needs to overlap quite a bit. It’s too easy for the back to gape open and show the white of the pillow.