I made this duvet cover for my daughter at least 10 years ago I think. It has held up well.
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The mustard yellow is suede, the dark green is velvet, the solid purple is faux suede and the paisley is some sort of synthetic. The most "stable" fabric to work with was the faux suede. I didn't own a serger back then, but I think it would have solved a lot of problems. I didn't know about stabilizers, Teflon feet, walking foot, stitching with wax paper and so many other tricks back then, so there were a lot of headaches, cuss words, and general complaints about letting my daughter talk me into this. But the look on her face when I gave it to her completed was worth all the bad. She put her down comforter inside and immediately put it on her bed!
Not sure how big this will post, but it is also in my album under my profile page for a better look.