Mild hair conditioner - can also use baby shampoo, Castile soap, or fabric softener
Fill your bathtub with a few inches of lukewarm water. Use a bucket or sink for smaller items. Gently swirl in one tablespoon of mild hair conditioner (or one of the listed substitutes if you prefer). This step relaxes the clothing fibers to help you stretch them back into shape.
Add the piece of clothing that you want to unshrink. Swirl it around a little to make sure it's completely saturated. Add more lukewarm water if needed to cover the item completely.
Let the clothing sit in the water for 30 minutes to 1 hour. The fabric's fibers will continue to relax and loosen as it soaks. While you wait, lay one of the large towels on the floor.
Without rinsing or wringing, remove the soaked piece of clothing from the water. Drape it over your hands to keep it from stretching out of shape and let it drip for a minute. Then, lay it flat on the towel.
Roll the towel from the bottom to the top. Lightly press as you roll, so the towel absorbs some of the water. You want the item of clothing to still be damp, but not dripping, for the next step
Lay the second bath towel on the floor or other flat surface. Unroll your clothing and move it to this fresh towel. Then, working one section at a time, use your hands to tug and smooth the item to its original shape.Once you've reshaped a section, weight it down with a heavy jar or paperweight to hold it in place. (If you want, you can put a similar, unshrunken item of clothing on top of to use as a guide.)
Let the piece of clothing air dry on the towel. You don't need to rinse after this process, but can if you want. Just be sure to follow the item's care label so you don't shrink it again.
How to Unshrink Clothes https://housewifehowtos.com/do-laundry/how-to-unshrink-clothes/