I got this underbust JSK from ClosetChild, but it doesn't fit me properly. It has shirring on the back, lining with lace trim on the bottom, and a side zipper. I think it can accommodate a small A-line petticoat. Wrinkled from storage. (I don't have a mannequin, so here's an Insta selfie lol)

I don't know how to measure the bust of an underbust jsk, but my bust is 84 cm for reference and this is too big on me.

Measurements (flat):
waist: about 34 cm to 40 cm
from top of shoulder to waist seam: 37.5 cm
shoulder width: 35 cm
length: 98 cm

I live in a smoke and animal-free home.