Sorry, I struck out :(  I found lots of bras, but nothing remotely "retro" in nature.  The closest I managed was the link from RDNA, but that will need post work.

Maybe try posting in the 3D Modelling forum and see if someone there could make you one.  I'm not a modeller, but it shouldn't be too difficult for someone who knows what they're doing.  Even if it's just a prop you could use magnets to get it to fit a morphed up figure.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi