Photo is of the top/back of the dress, hanging up, with the zip open so you can see the lining on the inside. The ‘lining’ is actually a lightweight internal corset, in denim blue mesh, which just smooths the lines down to hip-bone level.
https://nfts.freeradical.zone/media_attachments/files/112/429/184/881/365/424/original/e5f153ba0d3a8591.jpeg