Non quilter with a question
I have an amazing quilt let just say I obtained from a hotel chain probebly 25 years ago now. It's a king size and I double it and put it just on my half of a full bed and the beadspread goes over it so no one sees it really. It's not even pretty but It's so heavy I can barely move under it (which I love) and so warm I just can't part with it. After 25 years of wash and wear it's starting to show it's age. I have looked at quilts hoping to replace it but have found nothing that compares to it. Down comforters are out since I am allergic to feathers. I have for now put it in a cheap duvet cover trying to preserve it but since it's a doubled king dosn't fit in a duvet correctly and despite all my pinning and sewing inside the duvet it shifts all over. Any suggestions? As a non sewing person how tough would it be to make a duvet to properly fit? Is there a certain kind of quilt I should be looking for that is real heavy? Or is there something I don't know about that might replace my old friend in weight?