I have turned a couple of my bargello tops into duvet covers. My ex preferred duvets to quilts but loved my bargello quilt tops so we compromised and I turned some into duvet covers. I didn't make the seam allowances any larger and used 108" wide batik for the backing because the top is mostly batiks and I don't find it too heavy at all. It has been washed many times and have not had a seam come apart yet! I posted a picture of the one that is on my bed right now but I don't know how to post the link to it.