Very pretty dress! Thanks!
Beautiful! I wish I could get dresses thsi nice for mey 34C and D enh 34hip ladies.
Install the Pinup version (or whichever), the corresponding mesh, and the same style for your desired size. Run BodyShop. Create a project with the pinup version, call it "Donor" or something so you remember it's not a "real" project. Create a project with the 34Cenh-34 mesh in that style. Don't forget to include the size in your project name! Drag the bitmaps from Donor to 34Cenh-34. Import the 34Cenh-34 project.
Warlokk explains this a bit better in his Body Shape guide. Link is in his signature.
Voila! Your Sims have a new dress in their favorite size.