tie dye. tie-dye, man, tie-dye it's groovy That would be
tie-dye. Bits of fabric are bunched together, secured with rubber
bands and dipped into various colors of dye to create the color
effects.
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For a colorfast tie dye a fiber reactive dye is needed such as
Procion Dye from the Dharma Trading Company.
Rit dye can be used but is not fiber reactive and not colorfast
and the tie dye will fade colors after each wash.
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Japanese Shibori is an influence on modern tie dye designs.