Here's Salvatore himself, showing off the folded fabric:
It has a drape like a challis, and goes beautifully with this:
This piece is a (mostly) wool boucle, with some gold metallic threads. It came from Valli Tessuti, a very high-end store located just off Via Tornabuoni, at Via della Vigna Nuova, 81/R. Here's the clerk who helped me, who very kindly let me have the entire bolt, although I only asked for (paid for) enough for a jacket. I ended up with 2.75 yards of 58" wide fabric, enough for a skirt as well!
Of course, I had to have a complete outfit, so I headed over to Bacci for the blouse and lining:
I found the perfect olive colored silk in a crepe-backed satin (or satin-backed crepe, if you prefer), and got three yards (it's 56" wide). Bacci Tessuti Shop is located in Via dell Ariento 37/R (tail-end of the San Lorenzo market), and definitely has the largest selection of reasonably-priced fabrics in all of Florence. If you have only time for one store, this should be your destination.