After you get rid of the mist in Mt. Rikuroa, return to Drake Castle. Go outside Drake Castle. You will find a market here. Tell Noa that the people will be glad to talk to her. She will talk at various shops. Go to her at the Weapons shop. The dealer will give her a Fighting Robe. She will ask Vahn what money is. Answer "Sorry, I don't know. The dealer will give you a treat and the Fighting Robe for free. : Do not leave the market until Noa finishes talking -- if you do, you will not get it.