Unfortunately I cannot find the original measurements provided by the brand anymore. My own measurements are as follows (measured flat)

Length approx. 102cm (can be adjusted by moving the buttons)

Bust approx. 38-48cm

Underbust approx. 33-42cm

Bodice front length approx. 16.5cm (measured in front center from top to waist seam, not including straps)

Bodice back length approx. 9.5cm (measured in back center from top to waist seam, not including straps)

JSK comes with all original parts, namely waist ties, waist ribbon brooch, shoulder strap ribbon brooches (two) and a star charm chain (everything detachable). Shoulder straps come with two sets of buttons and also have plenty of extra length, so if you need longer straps just cut off and resew the buttons where you need them. Please note that due to the nature of the fabric the stitches of the vertical seams on the bodice, and on the darker parts on the skirt, are quite visible (please see photos). Straps have minor marks from where the ribbon brooches were attached (it came like this).
Barrette is reinforced and has a nice sturdiness to it but the interfacing shows a little through the fabric in places and there is some creasing (please see photos).
Wrist cuffs do NOT come with the little star charms since one of them fell off the first time I was wearing them and so I took off the other one as well (loose charms are also NOT included as I don't have them anymore).

All items worn around two times, I am the first owner.