I use my regular rubber stamps and fabric paint (paint specifically designed for use on fabric) that you can get at most hobby and craft stores. I just make my own paint pounce from a paper towel and press my stamp into the paint and do some tests on scraps until I get the right amount of paint to work on the fabric. Follow the directions on the paint. I will let the paint dry and then place a clean paper towel or fabric scrap over the stamped fabric and press it to set the image.
You can also find stamp pads that are usable on fabric. These can be found usually in artist studio shops that specialize in printing or on line.
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