Even now I had trouble with the Gymrat Xtreme pants on the Freak in Poser--but it works fine in Daz Studio for me.  Perhaps you can advise, there was a distortion in the mesh of the pants on the calf after posing that I couldn't smooth out.  I could get rid of it with post work--but it was very odd.  BTW I love the Gymrat Clothes and used the first generation Freak 3 set quite a bit.