What is a cordwainer in Waterdeep?

One of Waterdeep’s many guilds is the Most Diligent League of Sail-makers and Cordwainers (Waterdeep: Dragon Heist, introduction). What is a cordwainer in this context?

Merriam-Webster defines a cordwainer as a shoemaker, or a worker in Cordovan leather (archaic). Wikipedia has an article on cordwainers in the shoemaker sense. But Waterdeep already has an Order of Cobblers and Corvisers and a League of Skinners and Tanners. Cordwainers are in a guild together with sail-makers, so it stands to reason that they would have some sort of connection to sail making.

Any D&D/Forgotten Realms source is acceptable.