A short while ago, a scan from the most recent copy of Rolling Stone was released, featuring a look at the new Birds of Prey movie and a new photoshoot.
I do believe that in the image Margot may be wearing the Fleur Du Mal Cowl Neck Slip Dress in Coral Blush. This silk charmeuse dress features a side slit and adjustable straps. It is priced at £404.10.
Margot wore a pair of wedge leather lace up boots with zipper from the Ji Oh Spring 2020 Collection. These are not available. Thank you @normaniscloset!