I just got back from Sakura-Con this past weekend and they had an Atelier Pierrot/Chantilly fashion show on Friday. On the Saturday of the con I was lurking about in the Dealer's Hall and I happened to see the Atelier Pierrot booth ladies putting this dress
from the show onto their mannequin. (Pictures not of me, also not taken by me.)
Before they'd even finished, I was over there asking if it was for sale. Bought it on the spot. Seriously.
The long back is adjustable by three bustle ties and the cage skirt can be unbuttoned and removed. There are butterflies on the back and also one on the bonnet.