I preordered this jsk and apron in March waited for more than 6 month and it doesn't fit me.
It's size Large, official sizing says bust 98cm-106cm but it can be stretched to bigger than that, I was able to stretch to 110cm but I think there is still more room if you need, it was just hard to stretch and measure at the same time alone. 
I'm also interested in trade if you got the same dress in size M