Place a large pot of water on the stove top and add the avocado pits to the pot. Bring to a very low boil, reduce the heat, and simmer lightly for 30-60 minutes.
If desired, allow the dye bath to sit for up to 24 hours to increase the intensity of the color. When ready to dye, remove the avocado pits from the dye bath.
When you are ready to dye, wet the fabric with water, wring out, fold your garment as desired, and secure with rubber bands or waxed sinew.
Place all of the fabric items into the avocado dye pot and allow them to sit in the dye bath for at least one hour (and up to 48 hours) until it reaches the desired shade. The fabric will start out as a lighter color, but it will intensify the longer it sits – I usually let mine soak overnight until the next day. Keep in mind that the fabric will dry several shades lighter than it looks when it is wet!
Carefully remove the fabric from the dye, unwrap, and rinse until the water runs clear. Allow the garment to dry completely, and if possible, wait a week before machine washing to allow the color to set as fully as possible.
Always use a mild laundry detergent and store fabrics out of direct sunlight for long-lasting results.