After cutter two exact pieces of berlap the size you want your pillow, cut your muslin a few inches narrower on each side, and you will need about 2-3 times the length of your pillow to allow for the ruffles.I folded the top of the muslin over what would become the back side of the front piece of the pillow, centered it and stitched it.
This is what it looks like when you flip it over.
Start gathering and pinning the opposite side, using the same method I used for the table runner today. Gather as you go on the opposite side and pin each time to keep it even.
Now you are ready to stitch the other side. This side is super fast since it's already pinned. I just let the other end hang over, because it will be inside the pillow after I stitch this edge.
Put the two berlap pieces, right sides facing in, and pin around the edges. Stitch around all sides, leaving a hole that you can fit your hand in to stuff.
Here is what it looks like after you turn it inside out.
Fill it with what my girls call "fluff". ;)
Tuck in the hole and pin it closed. It's not super easy to hand stitch berlap, but the biggest trick is on the first stitch, instead of knotting the end of the thread like you would normally do, put the thread throught the fabric and tie it in a few knots. No matter how big you could make a knot, it would slide through the berlap, so you need to knot the thread with the berlap inside the knot.