I was very pleased with the final outcome, despite the wayward seams of the "quilted" front (I know how to fix that now), that I decided to share a tutorial with you.
How to Sew an Envelope-Back Pillow Case
pillow form (mine was 12"x16")
basic sewing supplies (sewing machine, thread, pins...)
For the front piece:
Cut one pieces of fabric for the front with sides measuring 1" larger than your pillow form. (So, since my pillow form was 12"x16", my front was 13"x17") This will allow for a snug fit, using a 1/2" seam allowance.
For the back pieces:
For the back, you will have two pieces.
Cut one piece at 1" wider than your pillow form, and 2" longer than half the width of your form. This will be your bottom top piece. (So mine was 17" x 8" since half of 12" is 6" and 6" + 2" = 8".)
Cut one piece at 1" wider than your pillow form, and 3" longer than half the width of your form. This will be your bottom back piece. (So mine was 17" x 9" since half of 12" is 6" and 6" + 3" = 9".)
For nice clean edges, fold 1/4" of the longest edges of a back piece. Iron down. Then fold that hem again 1/4". Iron down. Sew along this hem. Repeat on the other back piece.
With right sides facing, pin the back top piece to the pillow front. Then pin the back bottom piece onto the pillow front. It should lay on top of the pillow front so that when the case is turned to the right side, the pillow back piece is on the inside of the envelope back. Also, make sure that the envelope seams are straight.
Place sewing machine needle along any of the pillow case sides. Do not start in a corner. Sew down about an inch and then backstitch to reinforce seam. Sew around the entire pillow form. When you have reached your starting place, backstitch again.
Turn pillow case inside out and iron along seams for a nice, crisp look. Insert pillow form and enjoy!
I made this pillow form for myself. I am super picky about seams (even the ones you cannot see), but since it was for me, I did not pick this battle. Had I picked it, I would suggest that you serge the inside seams for a more professional look and to keep edges from fraying. At this point I do not own a Serger, but what I normally would have done is to complete the preliminary prep steps for all of my edges. Doing so would have meant that I would have needed to increase my pillow pieces another 1/2" around to give room for folding down edges and still having an ample sewing allowance OR I could have just zigzagged my edges.
If you decide to make an envelope pillow-case, please let me know or link up to this post. I'd love to see your creations! And as always, if you have any questions or suggestions, shoot me an email or leave me a message in the post.