It depends on the effect you want. If the piece is garment-dyed or garment-washed, printing is usually applied afterwards, because aggressive washing with stones or enzymes would damage the print or age it unevenly. Exception: vintage-effect prints are done before, for the worn look.
Printing on pieces that are already washed and relaxed avoids shrinkage that distorts the print. On unwashed fabric, watch shrinkage after printing. Ask your washing house whether the print withstands the proposed processes.
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