The key to unshrinking a sweater? Using items that relax fibers. “Materials like hair conditioner, baby shampoo, borax and white vinegar all work by relaxing the sweater’s fibers — which is what ...

Soak the sweater in cool water with baby shampoo or fabric softener to relax the fibers for reshaping. Gently stretch and pin the sweater to its original shape on a board, then air dry away from heat.