Victoria 4, wearing SWAM's Audry Hair, SanziSannzi's 3Zi_DC50sFlareOnepiece dress, and elleque's Pearls for you necklace and earrings.
3Zi DC50sFlareOnepiece is a 1950s-style sleeveless dress, designed by Sannzi for Victoria 4. The outfit is a hybrid, with a conforming top and a Poser dynamic skirt.
This is Poser dynamic wardrobe; it cannot be used as-is in Daz Studio 3 or 4.0 through 4.10. There are, however, means by which you can drape in Studio 4.0 or higher using the paid VWD Cloth and Hair at Renderosity. If you have the dynamic plugin from Optitex for Studio, the paid DynCreator for DazStudio will take the clothing prop and convert it to something Optitex can work with. Daz Studio 4.11 introduced dForce, with which most Poser dynamic clothing items can be made to work by applying dForce surface settings. Some tweaking may be necessary.
Free resources for 3Zi DC50sFlareOnepiece include:
Additional textures for the dress are available at the main page for the dress; the link "NewMat50sOnepiece" is immediately below the link for the dress itself.