The finished blocks need to be 9.5" square so I use my handy-dandy 9.5" square ruler to trim all the blocks. This ensures that all the blocks are the same size and have a straight edge all the way around. It's pretty easy if you find the center of each side and align the 4.75" mark with them. I center everything on the clothing square.
On this quilt I used two layers of flannel on the back. I always use one layer for the middle, but this customer wanted an especially cuddly quilt so we went with flannel for the back layer, too.
After assembling the "sammies" I put a couple of pins in to keep everything in line until they can be sewn together.
Then I stitch around the "ditch" where the frame is sewn to the square. This makes the stitching about invisible on the front. And it makes a nice square pattern on the back. Usually a rag quilt is sewn with an X, but that won't work with this type of quilt.