I have no experience quilting.  I do have a lot of experience with almost every other area of sewing.

Here is my problem.  I have a very old, much loved, comforter that I need to replace.  The outer rim has no filler.  I guess due to so much washing and drying it has migrated toward the middle.  The top/bottom 4-6 inches are flat..w/o filler.

This comforter is made of nylon tricot and stuffed with fiber-fill.  I’m pretty sure that the reason they didn’t catch on is that when you sleep under them they slide into the floor.  I found that if you don’t use a top sheet, they seem to reflect your body heat and you feel warmth the moment you get under it.  It’s amazing, there’s not one moment of wiggling around to get warm on the most bitterly cold nights.  I discovered about a year ago that sleeping bags are made like this.

I’m not interested in making an heirloom, I just want something functional.

Here is my question.  If I were to make a duvet cover of tricot (maybe even 2 layer,) and used it over a new inexpensive comforter, would it work the same?  Would the layer of fabric on the comforter that’s between the fiberfill and the tricot covering prevent it from functioning like one without?

I’m hoping someone out there can help me.

Thanks.