I had to draw up a plan for how to convert a piece of flat cotton knit fabric (60" wide by 88" long) into a long stretchy tube (11" wide by 145" long) to cover up this sort of curly body pillow. It is a super stretchy knit, so I was pretty sure it would stretch enough around the curves. I finally figured out, after several incorrect figuring, that all I had to do was cut in half lengthwise, and then sew the short end together, then fold that in half and sew down the 176" long edge.
Here is a more recent picture of why I'm even making this pillowcase, the cover that it came with is made with one of these newfangled "cooling" fabrics. Which has pilled up in such a horrible way that I don't even want to touch it, the texture just feels so awful to me. Not terribly relaxing! But definitely cooling. Hopefully the cooling feeling will come through the new pillowcase.
I made myself do a little test with the fabric before I started in on sewing that long 176" long seam. I first had to change my sewing machine needle to one that is made for sewing with knits, this is my reminder to myself to *change it back* now. I also used my Overcast foot which worked very well.
A note on this fabric, this is a shopping-from-my-stash sort of choice. I have had this organic cotton knit fabric in my stash since I bought it to make my kids **BABY** clothes. It was all the rage back then in the early 90's, organic fabrics, and there weren't a lot of baby clothes being made with them that were at all affordable. I don't even remember where I bought this, I think it was likely from a crunchy-granola-mom sort of catalog. I also have a smaller piece that is striped, which I didn't use for this project.

The upshot is, I bought the fabric with good intentions of clothing my little babies in something "safer" just because it was organic, but then life got a lot more real once I was raising two under two years old. I always figured I'd make myself a t-shirt or something and maybe dye it, but that never happened either. So, instead of going to Harts Fabrics and buying one of the patterned knits they currently have in the shop. I told myself if this experiment didn't work out, then I'd do just that.
But it did work out, and maybe I'll dye it at some point, but this is now finished. I can cross off the Body Pillow Case from my UFO list.
I first sewed the long seam along edge, starting from the middle, and then I laid it out on the pillow to make sure it was long enough to make it around the corners.

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Looks okay on the end, and oh yes, it's very soft.
I made a drawstring turned over casing on one end and cinched it all up with a ribbon.
There it is! It's very stretchy and cozy. It's kind of oversized, but it needs to be washed and dried before I sew it down to a smaller size. I really like how it turned out and look forward to using it tonight.