I work with anim8or (free) and it handels obj files like a champ. But first you have to export the different groups from Poser itself. Then fiddle a bit in anim8or to reconstruct the figure, make the clothing, and export back. Uv map it as you like, make the texture, etc. If given the time I'll make a tutorial. Skintight clothes can be made by scanning what you want to make, put it on a second texture, blend it with the skintone in Poser, and get the thickness with a black and white displacement map.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
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