Wardrobe Wizard is made by PhilC.  You can buy the expansion packs here:

http://www.philc.net/store_WW_Extra_Figs.php

You need Expansion Pack #2.

WW is a Python script.  You load it using Scripts -> Wardrobe Wizard Menu.  You'll see the WW buttons in the Python Scripts palette then.  (If you don't have that palette up, it's under Window-> Python scripts.)

Instructions are in the Poser manual.  It's pretty easy.