The clothier does, in fact, know the typical fashion of their destination (Chennet), and even has something similar enough in stock - plain blouses and brightly woven skirts (the two islands trade enough that Chennet mostly just uses Cloudshear's fabrics or homespun, but they're far less fond of embroidery, she informs them). They won't pass for peasants, but the fabric is fine for castle servants - she clearly assumes they're looking to apply for a position there.
She also enjoys chattering, and if not interrupted, talks at length about traders from Chennet who've come through, her opinion of the castle's lord (low; she recommends staying out of his way as new workers - her second cousin worked as a maid there for a time and got fired after what she assures them was really a minor mistake), the one time she visited Chennet on business, the meanings of the different patterns in embroidery, Dayo's necklace ("You've come through past Thyls, then? I like their jewelry, but can't stand the lack of a sun..."), or anything that comes to mind.