Which version of Poser are you using? Are you using the version of WW that goes with that version of Poser? Do you have the add on for V4 for WW? WW only comes with figure support for the figures that are part of each version of Poser's included content. If you have P11, that version of WW has support for all the included figures from Dork and Posette to Paul and Pauline. Figures like V4 require you to purchase an add on from Phil at PhilC.net.

WW has been able to add figure morphs to clothing long before Morphing Clothes and Poser's Fitting Room. I use it to adjust the fit of clothing to a heavily morphed base figure before adding the morphs to the clothing.