Link to the preprint. Final version published in Cryptologia (Aug. 6, 2023). In 2013, an archeological curator bought a Victorian-era silk bustle dress from an antique mall in Maine. When the curator, Sara Rivers-Cofield, examined the dress, she found a hidden pocket that contained mysterious handwritten messages that appeared to be some sort of code. Since then, codebreakers have tried to solve the messages without success. The so-called "Silk Dress cryptogram" became one of the top 50 unsolved codes and ciphers in the world...