Charlotte's Fusible Web works great. I pinned one side to a flannel blanket and zigzag stitched the seam allowance with the gauzy thread on the spool. Then I turn the insert over and press the folded edge down. The gauzy thread stuck to the wrong side of my binding, allowing me to sew on the right side or in the ditch if I positioned the wrong side correctly, and I was able to sew without using pins. This will ensure you catch the underside of your duvet. I was concerned that using the whole flannel would be too thick and it wouldn't work. But it wasn't. It worked great.
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