BTSSB Old School JSK in a Black / Black colorway. I believe it is the Cul de Paris JSK but I might be wrong. 

Features beautiful crochet lace and removable bustle.

This was purchased on Lacemarket. It is in a good condition for its age, some slight fading but still a deep black. However, the previous owner tightened it to fit her her underarms/chest, so it is tighter than the original. For that reason I would only recommend this to a true size XS. 

I ship worldwide from Portugal, please ask for a shipping quote.