Years ago, when I was interested in learning to knit (and yarn was a LOT cheaper), I picked up a lot of knitting needles and a quilted holder for all of them, but none of it hs seen much use in recent days, and I don't seem to have either the time or the patience to knit anything as complicated as a sweater. I do, however, have a desire to have warm throws to use in cooler weather, and still remember the toasty knitted afghan that my grandmother used for years. Real wool yarn is rather expensive, and the synthetic yarns don't have the warmth of wool, so I've actively started reclaiming the wool from old sweaters that have outlived their usefulness as clothing. The first one to tackle was an old Irish wool cardigan.
Finding the seams in the old sweater was the most challenging part as the sweater pieces were held together with the same yarn as the body of the sweater, but eventually I got the whole thing de-knitted and rolled into balls. Those balls, in turn were wrapped into skeins and gently washed in the bathroom sink and hung to dry over the bath. Once dry, they will be rolled back into the balls of yarn I prefer to use and stashed in a bag to keep them clean.
I happened to have an old sweater that fit thebill for this project, but it would be just as easy to find a few old wool sweaters at the local Goodwill store for a few dollars each and de-knit those. Considering the cost of real wool yarn, this option would be far cheaper. providing an inexpensive alternative to store-bought yarn and keeps soem old sweaters out of the landfill.