rainbowsandunicornscrafts: you could really use any plastic toys for this.
DIY Vintage Barbie Tee Shirt from Trash to Couture here. She made this for her neice who loves Barbie. You need tee shirt transfer iron on paper and a vintage Barbie image (I’d start here). Ink jet print the image onto tee shirt transfer paper and then add the 3D elements like tulle and ribbon.