I know that this post is a bit out of topic, but I don't think it is actually worth a new one.
When we have completed the LoraTay's quest, we may ask her to sew a robe. If we ask her to do so, we can ask her:
"Where can I find silk?"
She answers then:
"Hetchel on the Tulimshar Marketplace can weave them for you
I didn't see her the last time I visited, though.
She may be visiting family. Tough luck!"
She even says that "Six sheets would do fine, if they're the usual double elbow squares" (this makes 25 cocoons per sheet).
I've seeked for Hetchel when I reached this step when I began the game (and never found her of course

). I still wonder why Hetchel does not exist. This NPC and Silk Sheet item (*) could be an interesting step in some quests such as this one...
Nard
(*)we have now the beginning of a new item class: Crafting items/materials (cocoon, cotton cloth, leather patch, reed bundle, raw log, Iron ore and ingot, pelts and furs ...) and 2 subclasses: raw materials and semi-finished ones.
Sorry for multiple edits.
Nard