1. Cut two rectangles measuring 4"x3". The 4" side is the hemmed side. I used one of the sleeves from an old shirt of mine, as you can see. You could also use the bottom hem of the shirt. I just didn't want to hem one side of the little flippy thing. If you want to hem it yourself, just make sure you add in a little extra fabric for folding over.
4. Trim the extra off the end of the flippy pocket so that it matches the angle of the sleeve and continue on with the rest of the tutorial!
Now, I'm no expert, so if this is confusing, or you have a better way, let me know! Have fun making newborn gowns with flip over hand covers!