And for anyone else who, like me, wonders where you find the recipe for these sashes, I think it simply shows up in your inventory when you accept the quest.
The quest text doesn't say anything about that, though, so I spent a bunch of time checking my existing recipe list and looking at nearby vendors. Eventually I gave up and went off with my fellowship to do other quests, and later when I needed some bag space I decided to scribe some other tailor recipes I'd acquired, so I clicked on all my recipes and only then discovered that one of them was for the sashes!
Edited, Nov 22nd 2007 4:45pm by Sukrasisx