See, I was thinking because of the way it is cut / in the first pic rather than \ I don't quite see how it could go below the bust line. But if everyone thinks it should go below the bust line, then I will create the pattern that way.
Neoprene is a funny material, it's really hard to have a neoprene suit hold the bust without inserting a elastic band. I don't see an elastic band in the armpit area shot. See, if it goes above the bustline, it would match the angle of the first pic. We wouldn't have such a problem with matching everyone's bust size/chestline, And, it would supply the reasoning for why the suspenders are there, to keep the crop top from riding up and to keep the pants up. And, we could always "tack" or sew on the upper bodysuit to a tank/whatever black leotard underneath to keep the crop top from riding up.
check out what i mean at the bottom pic
http://www.geocities.com/zamwiam/Pattern_questions.html?1044816622893