I ordered the JSK in custom size, unfortunately I've never worn it. It's completely new, I only washed it and tried it on and I don't see myself wearing it anytime soon.
The shirring is quite flexible and it should be possible to wear it with a bigger size than described below. 

Bust size: 118 cm
Waist size: 94 cm
Shoulder width: 40 cm

Shipping to Germany tracked 5,49 €, without tracking 4,79 €
Shipping to Europe: tracked 12 €, without tracking 10,49 €
Shipping to UK + Northern Ireland tracked 19 € (without tracking 15,49 €)
Shipping to the US, Canada, Australia tracked 22,49 € (without tracking 18,49 €)