Back/underside of the hat
Inside of the hat.
The pattern calls for taffeta backing (which serves as the lining). Since I wanted to use Bemberg from stash, and that isn't as stiff, I put in a layer of soft-ish organza between the Bemberg and the outer fabric.
The main bow piece being interfaced with organza. The instructions say to baste near the roll lines (and I assume that basting is meant to be taken out later). I decided to use a permanent catchstitch instead.