^OED, s.v. "Paduasoy"; the deformation of a "Padua say", a kind of serge from Padua (OED) intends an undeserved connection to "silk of Padua". This has misled the unwary: "She was attired in a robe of the rich silk of Padua known as paduasoy, of a soft lustrous texture, shot with threads of silver" (Isabella MacFarlane, A Royal Knight: A Tale of Nuremberg
1905).
^According to Leanna Lee-Whitman, "The Silk Trade: Chinese Silks and the British East India Company", Winterthur Portfolio, 17.1 (Spring 1982:21-41), esp. pp 30f.