At some point in his life the Illyrian warrior Proteus opened this clothing shop in Windhaven camp. When The War with Hybern breaks out he is one of the warriors who participates in it and never returns.
After the end of the war his daughter, Emerie, takes over the shop and declares it her property, which is why the inhabitants of the camp apparently stop buying there.
On one occasion Cassian goes in and buys all the winter clothing that is available. He tells Emerie that a great storm is approaching and asks her to distribute the clothes to those most in need, as a gift from their High Lord, Rhysand.