This method of un-shrinking clothes by soaking them in lukewarm water with shampoo or conditioner, gently squeezing out excess water, and then stretching the garment while damp is considered one of the most effective techniques. It works well for natural fibers like wool, cotton, and cashmere. Compared to other methods such as using a fabric stretching spray or commercial products specifically designed for unshrinking clothes, this DIY approach is more cost-effective and gentle on delicate fabrics. Additionally, it allows you to control the process and avoid potentially damaging chemicals.