I made two double knit (polyester) quilts from "grandmas'" old clothes for daughter and granddaughter. I used a decrotive (*) stitch on my machine and tacked every 3-4 inches as if I were tieing it. The quilts turned out beautiful as I used half triangles as well in the blocks. The ladies loved the quilts. They were double bed sized and I backed each of them with polyester bed sheets. With the knitted sweaters, I made throw pillows from them. They went over big with the daughter and granddaughter as well. I too have tubs of polyester fabric gifted to me from deceased older women's stash. I will either make quilts or cut into strips and make crocheted rugs. I made a couple of throw rugs from some of that type of fabric from my own stach, purchesed years ago. Good luck! Mary