If you want to make a pillowcase - here are the instructions.
This was done with the "Burrito" method - so there are no raw edges. Cut: 27" piece of the main fabric WOF; 9" piece for the cuff WOF; and a 2" piece for the accent WOF. Align the fabrics and trim so they are all the same width. Press the cuff and accent fabric Right Side Out lengthwise. Open the cuff fabric and lay out right side up. Layer on the main fabric right side up, and then the folded accent fabric. Roll the main fabric up until it fits inside the pressed fold line of the cuff fabric. Pull the other edge of the cuff fabric up to enclose the other two fabrics (like a burrito!). Pin the edges together, and stitch the edges with a 1/4" seam allowance. After the edge is sewn, pull the fabric from inside the burrito - out until the main fabric is fully exposed. Lay the right sides of the main fabric together and sew the side and bottom seams - finishing edges. You can zigzag, or serge edges. I completed mine with a French seam - by putting the wrong sides together stitching the edge at 1/8" - turn inside out, and then stitch the edges again at 1/4". That's it! Quick and easy!
The Missoui Quilt Company has a nice video showing how to do this on You Tube if you prefer to see the actual steps rather than read how to instructions. Enjoy!