I actually finished it a while ago, but didn't get around to taking photos until today.
(full photos available here)
I embroidered the letters in ordinary DMC embroidery thread, trying to match the scrawly font on the pot itself.
I also matched the sides, so the English embroidery is almost exactly on top of the English writing on that side, etc.
After the embroidery was done, I tossed it in with the laundry. Although the rest of the load was dry, the cozy was still quite damp. Even though we almost immediately put it on the pot and sort-of massaged it to form to the pot's shape, you can still see that it creased a bit in the wash.
You can also see by the stain that the spout portion is doing its job quite well. :-D