During World War II Allied intelligence made ingenious use of knitting to communicate secret messages. Female spies and resistance fighters wove coded details into patterns of knit and purl stitches on everyday garments. Agents such as Phyllis Latour Doyle turned Morse code into hidden signals in scarves and sweaters while Belgian resistance networks relied on subtle stitch changes to track enemy movements. In 1942 the US Office of Censorship banned knitting patterns from being mailed overseas t