How can I unshrink a piece of clothing?
If a favourite garment has shrunk in the wash, you can try to rescue it with this simple method.
Gently soak the item in lukewarm water mixed with hair conditioner or baby shampoo (approximately one tablespoon per litre). Then, carefully stretch the fabric back into shape and dry it flat or under gentle tension – for example, by pegging the garment to a drying rack.
The reason this works is because conditioners have chemicals known as cationic surfactants. These will temporarily lubricate the fibres, making them more flexible and allowing you to gently pull everything back into place.
This process can’t completely reverse extreme shrinkage but it can help recover some of the lost size, making the clothes wearable again.