DAZ is not the place to look for stuff for Jessi. You could get Victoria 3 there, though. She's got a lot more clothing and stuff than Jessi.

I haven't seen any stockings for Jessi, but there might be some. Here (in free stuff and in the MP), RDNA, and Content Paradise would probably be the best places to search.

For a unitard, try searching on catsuit or bodysuit. Those are the terms generally used in Poserdom for that sort of garment.