Do you actually hae any of the OptiTex cloth? Thisisn't a tool for using Poser-style clothing OBJs, it requires specially made clothing models which specify how they are made from pieces of fabric - there's atablecloth, which was free, and a set of outfits for Victoria 4 so far. Adding some kind of support for clothifying arbitary objects is on the to do list, but not yet done.