I've made some sweater quilts. Hope my picture uploads, we"ll see. Cashmere and wool will felt up when you wash them in hot water and dry them in a hot dryer. Then you can cut and sew then like fabric. I've only done 1 out of acrylic. I just used a wide enough seam and a short stitch. I think it's stayed together so far. It was made out of my dad's sweaters and 1 of them had my dad's name embroidered on it. I gave it to my brother and I think he's stored it away so nothing can desecrate it. lol
Oops! Just previewed my post and my pictures did not load.......now I have to read the directions.......((heavy sigh)))