Check the hat’s material and care label
Use warm water for wool, cotton, or canvas hats
Use steam to gently shrink the hat
Soak the hat briefly in warm water if needed
Put the hat on a smaller form or stuffed towel to dry
Let the hat air-dry completely
Repeat the process gradually if more shrinking is needed
Avoid high heat on delicate or synthetic materials
Use a tailor or hat stretcher/shrinker for expensive hats