Mary Magdalene Madeleine Chiffon Dress sizing!

Hi all!

I've been eyeing this absolutely gorgeous dress for ages and I noticed it was rereleased once (total release was twice).  Since there's a chance of it being rereleased at some point in the future, I want to ask about the sizing of this so that if it does pop up again and it fits me, then i'd want to jump on it asap!

http://www.marymagdalene.jp/contents/dress/232/0101/

• バスト：85cm～（ゴム上がり寸法）
• ウエスト：66cm～（ゴム上がり寸法）
  （シャーリング、編み上げで調節可）

The bust and waist are listed and says there's shirring on the back (which can be seen in the pictures too), but it doesn't really say how much the shirring goes.

Anyone who owns this dress can tell me the max bust and waist size for this OP?  I've tried googling as well as looking in the tags for egl comm but found nothing so far.  :\ 

Thank you!!