The heat from boiling water constricts the fabric fibers, making the shirt smaller.
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Fill a large pot with water. Make sure there’s enough water in the pot to completely submerge the shirts you want to shrink. Put the pot on the stove and bring the water to a boil.
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Place the cotton shirts in the water. Use long-handled tongs to carefully press the shirts into the water so they are completely submerged.
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Leave the shirts in the water to boil for 30 minutes. Turn off the heat from the stove, then carefully dump the boiling water and the shirts from the pot into a sink or tub.
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Allow the shirts to cool down completely in the sink. Remove the shirts after they’re cool and wring them out gently to remove the excess water.
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Put the shirts in the dryer on high heat until they are dry. The heat from the dryer also helps shrink the shirts.