When I worked in a Nursing Home, we had a laundry lady who was an unwitting expert at repeatedly felting very nice knitwear. We had to "let her go", as she was costing the company a fortune in replacement garments!
Koffipot's tragic tale reminds me, I have a beautiful brown pure cashmere sweater. It fitted my mum a few years ago. Now it would fit a four-year-old. (Her error, not mine thank heavens!) She's given it to me and it awaits the right needle-felt project! I might turn it into a bag one day.
Here is a second sweater that I bought to felt in the machine. It went in a 40 degrees then 60 degrees then 90 degrees! It had not felted enough at 60, I think it may have some acrylic in it.
I have to confess a friend sewed it together, as she was taken with the idea and wanted to help. Inside there is a lovely deep pocket made out of the cuff. I wanted to utilise the arms for the handle but it would not have looked right in the end, so I decided to make felt balls and 40 later.....I have a nice handle.
It turned out just as I hoped, a good experiment, it cost £1 from a charity shop, hope you like it.