The water temperature is too hot
A certain amount of shrinking of your clothes is inevitable as a result of them undergoing multiple washes, but consistently using hot water to clean them, specifically at temperatures above 70°C, can accelerate this process dramatically. Particular types of fabric are more prone to shrinking when exposed to high temperature washes, so always read the care label on your clothing items for instructions on which temperature range you can wash them. For more information about when to use hot and cold water to wash your clothes, click the link below.