Super cute jsk! I got it custom sized but I think I did it wrong because it's really baggy and too long on me. I've had it for a while and don't love how the color or cut looks on me either, so I'm selling it with the hopes of getting a different version later.
For sizing, I'm about 170cm, with 86 cm bust and a 70 cm waist. When taking my measurements for this I rounded up a bit, but it ended up really large. The straps and torso are too long, and it is too wide on my waist. It has a good amount of stretch because of the shirring panel, it's about 14 cm unstretched and goes up to 30 cm stretched. With all that said, I'd estimate the size is about 72cm- 88cm, and the bust is 88cm-104cm. I included a picture of it on me to try to get the point across but the fit issues are a bit hard to photograph. 
Also comes with the headbow!