I used medium heat, a very clean iron and of course no steam.
Here is the list of the fabric sizes I harvested from the gown, all that's left are some smaller pieces that I may have to work in somehow to get close to the desired size.
It doesn't seem like much and it is causing me some brain strain trying to figure out how to put it all together into a quilt top! I keep thinking there must be some software out there for the computer to figure it out for me, and it would have to be Mac compatible. Right now I have resorted to drawing diagrams on scrap paper!