On another planet...

[SideshowMel]

That would definitely work. Sewing stretch fabric is tricky. Use a ball point needle, & check your machine tension first on some scrap, you may need to adjust the tension cos it's stretch fabric. If you cut the undersuit, remember to add seam allowance, or unpick all the seams so seam allowance is included. You could also buy a leotard pattern if you didn't want to burn a perfectly good undersuit.

That's all I got, I have never sewn stretch fabric.