I have made wrist warmers in grey yarn from yaks, bought at the Fanø knitting festival. At the same festival there were another set (really there were many) I liked. I bought the kit to make feltet wristwarmers. It was the same thin wollen yarn used for the baby blouse, but in more lively colours.
When I had followed the measures in the recipe, I was wondering if they would felt enough to fit me.
After finnishing them, I took the chance of felting them in the washing machine. It went fine, and the final product are in use. I love the warm feeling.