What will remain the same are the dimensions of the cut pieces.
For ONE regular size pillowcase you need:
1 - 25"x 40" piece of fabric ("main")
1 - 1O"x 40" piece ,of fabric ("trim")
1 - 2" X 40" piece of fabric ("accent")
Note: all seam allowances are 1/4"
Begin by folding the 2" accent piece in half lengthwise.
I then sew a seam across the top of the case, and then a seam down the side. I like to sew the seams rather than just serge them as I like to do a good back stitch at the end of the side seam. Once I have stitched the 2 seams, I then do a serged edge. If you do not have a serger, you can pink the edges are do a zigzag stitch just to keep the fabric from fraying too much.
The inside of my finished pillowcase.
I hope this simplifies the process. If you are planning to join in on the pillowcase drive for the Mary Bridge Children's Hospital, let me know, firstname.lastname@example.org. You can see all the posts about this project here, http://www.rhondabuss.blogspot.com/search/label/Mary%20Bridge