Besides snagging delicate clothes, zippers can catch in your washing machine’s drum. Cotton shrinks because of the tension that is applied to its yarn and fabrics during the construction of the clothing. Most cotton clothing will shrink during its washing.
The best way to avoid shrinkage is to wash them by hand or Ideally, your clothes that are made of natural fibers should not be machine washed. Lay your clothes flat and let them dry on their own. Cotton clothing can be dried on hangers.