Using controlled heat from your washing machine and dryer to shrink a shirt without sewing. Start by washing the shirt in hot water, which causes the fibers to contract. Then, dry the shirt in a high-heat setting to further encourage shrinking. Be cautious and check the shirt periodically to avoid over-shrinking. Different fabrics react differently, with natural fibers like cotton and wool shrinking more easily than synthetics. For a more targeted approach, boiling water can shrink specific areas. Dip the part you want to shrink into boiling water for a few minutes, then dry it with high heat. Always refer to the care label first to ensure the fabric can handle this treatment.