If you accidentally shrink your favorite jumper, you may just be able to save it if it is still damp. Lay it out flat and smooth it into shape. Taking an end in each hand, try a gentle, slow tug along the line of the weave. Proceed cautiously, testing the give in the material, and working as evenly as you can. As the garment narrows you’ll need to do the same across the weave. Be mindful that the seams and any detailing may have shrunk more, or simply be weaker, so these may need to be stretched gently first. Always begin gently. If you are lucky you may be able to build up into a powerful stretch providing you build up gently and cautiously. Warming the fibers with your hands sometimes helps. If the day is warm and you can be at home, you may be able to rescue woolens which have shrunk badly if you wear them whilst wet, gently tugging and smoothing them to your shape. At worst you can still wear it for gardening, but sometimes the most dramatically shrunk items respond incredibly. Or, on occasion you realize you have very charming fitted garment that looks better than the slouchy weekend knit.