If you do laundry then you know that you can’t wash and dry wool and other natural animal fibers as you would cotton or manufactured blends. If you didn’t know that then I guess you’ve learned something today then. If you’ve ever accidently shrunk something, try Unshrinkit, the liquid that will un-shrink your clothes
So this does not work on felted clothing, that is to say, extremely shrunken wool knits. The formula helps to stretch slightly shrunken clothing back into its original size, gently, so as not to pull it out of shape.
It supposedly helps to release the bonds of proteins found in wool and natural animal fibers so that they relax, returning the piece to its original size. You soak it in this solution, then stretch it out gently. Once it’s stretched back to size, just rinse with cold water. The product has low ratings but your mileage may vary because fibers are very, very different. Still, if you have a shrunken sweater that is too small to wear, what have you got to lose? Unshrinkit is $11.99.