Hi
Can you post a screenshot of your FBX export options, Do you have the same problem with any other DAz Genesis models or just this one. I do not have this character so can not test it myself but it looks very much like the clothes have not been merged with the body ...
Can you give a quick run down of the steps you took ..
thanks

I Make My Mates Do The CanCan For The Amusement Of Killer Robots:D