Attach your ruffler to your sewing machine, and using a long stitch length, sew along one of the longer raw edges of the ruffle piece. Line the edge up with your ruffler guide, which should end up being about 1/4" seam allowance. Note: If you don't have a ruffler, you can sewing a basting stitch and ruffle the fabric by hand. You want the ruffle to be about 40 1/2" to 41" long. If it's a little longer, no worries, you can gather it a little more later when you pin it to the pillowcase. If it's too short, you may need to redo it. Remove the ruffler and reattach the standard presser foot.
Serge the two sides of the pillowcase. Then, serge the 2 shorter ends of the ruffle together so that you have a continuous loop.
NOTE: I accidentally did the steps out of order and hemmed the ruffle piece before serging the shorter ends together, which is why you see it hemmed in previous photos AND a seam ripper in the pic below. Please follow the steps in this tutorial so that you also don't have to use a seam ripper! ;-)
Fold over one of the long edges no more than 1/4" and press with an iron. Then, go back and fold over the same edge another 1/4" and iron. Sew a medium straight stitch (I used 3.0 mm length) very close to the edge to hem the ruffle. I recommend sewing slowly since it's such a narrow hemline. This will give you a nice, clean double hem for your ruffled edge! :)
Line up the ruffle seam with one of the pillowcase side seams. Pin right sides together (i.e. the "right side of the hem on the ruffle piece with the right side of the pillowcase). Beginning at the seams you lined up, work your way around, pinning the raw edge of the ruffle to the raw edge of the pillowcase. If your ruffle was a little long, you can gather a tad as you pin. If your was slightly short, you might be able to gently stretch the ruffled piece to make up the difference.
Sew a basting stitch with a 1/4" seam allowance (this will basically be sewing over the stitch you made to ruffle the fabric) to anchor the ruffle to the pillowcase. Tip: If your sewing machine has a free arm, now would be a great time to use it since you're sewing a circle. Also, I like to sew with the ruffled fabric on the top to make sure it's lined up correctly.
Once again, use the free arm on your serger to more easily serge the raw edge. And you're done! See, you did it! Now you can have ruffles and linen at home for a fraction of the cost of purchasing them at a high-end store. More ruffles, please! :)
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