Use the free anim8or as a modeler. www.anim8or.com
U can import referene pictures in all axes X, Y, and Z, and model using the pics as a reference in the background.

I scale Posette in Poser to X 70 and Z 70%, screengrab her from the 3 positions, and import those pictures into anim8or to make clothes for her.

Then I Use Poser, make a small animation of 15 frames, start from X-70, and Z-70, and use 100% onn the 15 frame.
Import the clothing in frame 1, scale as close as you can but do not touch Posettes obj, and let the cloth simulation push Posette into her dress. 

I did a small tutorial on this forum some months back
Tony

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!