"Tankini" is, I think, what you want - according to Ujena (my go-to for swimwear ideas).

http://www.ujena.com/xbikini-details.php?cid=185&pid=A328&st=A328

Notice the cut of the top?  Hard to see with the matching color and short on the hem line, but I think that is the cut in your first pic.  Now, to find a Poser version . . . :p

This swimdress is a bit long.

http://www.ujena.com/xbikini-details.php?vv=237&mm=A313

---

Anyway, more terms for searching. :)