Patterned using a technique similar to batik (3-4)

I believe the answer is:

tie-dyed

(Other definitions for tie-dyed that I've seen before include "Coloured using a particular technique" , "Coloured unevenly" , "Like some parti-coloured fabrics" , "Like some fabric patterns" , "Selectively coloured" .)

I've seen this clue in The Times.

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