I had to sew across this edge which makes a flat edge

Now on to the bottom cushions. They have cording and zippers. They are way more work. I saved the old zipper. first i basted the seam shut and layed the zipper on and pinned it.

I had to do corner darts . I made my own cording recovering the old cording from the old cushions. Save as much as you can from the original. I used a zipper foot to apply the cording. get it as close as you can keep reading on to older posts it goes on and on!
This project took about a month. Every cushion got a new muslin cover.
This couch is probably 10 years old. It is looking awesome.

This was a bear The L shaped cushions. Use lots of pins

You need to sew a piece of felt across the seam where the zipper is. If you don't when you go to put your cover on the seam will rip! Trust me I already did it

This is the L shaped part it was hard to do You need to baste and be patient. It took 3 hours to sew this cushion. The oblong shaped ones took 2 hours. There was one last cushion that went in the center that one took awhile. It was the biggest the zipper wrapped around the cushion it was a challenge. Its finished. The couch looks great and all fresh and new. There's a lot of satisfaction gleaned from restoring this piece. I kept it out of the land fill. Its still comfortable.
The arms need new foam. Stapeling that all back in might be scary. Hey I can't believe the transformation

Here it is all finished there were 2 like this
Once installed in the couch it was impressive. I made 6 upper cushions and 5 seat cushions. Now I have to arms left to reupolster.