Silver Thread’s shop is a tailors shop. The shop mistress and her crew can produce a wide variety of local styled clothing in a wide variety of local cloths. While not the producer of the finest clothing in the city, you could certainly do worse. The only limit to the shop is that they do not use exotic fabrics, nor do they import them.
The shop also makes things "for the rack". You can actually find ready made clothing here. (In any place but Antioch, this is a rarety until sometime in the 1800s or equivalent).
Silver Thread’s got its name from the sprite who taught the original owner (the current shop mistress’s daughter) how to sew with magic silver threads. The Shop’s Mistress is called Thimblia. The name came from her mother’s best friend, the sprite Thimblia. You would think a fairy graced child would be beautiful, graceful, and wise. Thimblia is plain, somewhat clutzy (except with her hands) and pretty stupid. However she is a good seamstress and a nice shop mistess to the guild orphans and waifs she trains and employs.