This is a set of clothes or accessories for figures.
From the Good Smile website:
From "Puella Magi Madoka Magica The Movie -Rebellion-" comes the long-awaited Nendoroid of Devil Homura! Her stunning jet-black dress and devil wings have all been carefully shrunk down into Nendoroid size. She comes with her standard expression as well as a smiling expression. Optional parts include the dark orb as well as a special hand part holding Kyubey. Enjoy recreating all of your favorite scenes from the movie!