I am assuming that you have not purchased/downloaded and extra content, and are working with just what comes with Poser 9. If this is not the case, please tell me the leotard you are using.

The Leotards are for Alyson, Not Jessi. I do not see one for Jessi. (I may be missing it, I seldom use the older Poser characters.)

Unless the clothing item is specifically made for the figure in use, all attempts to work with it will fail. You need a piece of clothing made for Jessi to work with her (or you need to run it through wardrobe wizard to convert it, but that is a whole other learning curve.

Try using Alyson and the included leotard and see what happens.

(Cross-posted with Red Phantom)