Export then Import will work for many things. Some models have splits, seams, doubled areas, turnbacks, or other elements that will make them poor dynamics. Pockets, belts, beltloops, pleats, can all be problems. Many of the Poser library items had "holes" in them that caused them to fail as dynamic items. So it's a potluck. How I do it, when it works: Open the clothing normally in the window. Do not conform. Use scale tools and magnets to get it to more-or-less cover the figure I want to drape on. Export an .obj file. The next step depends on the item. If it is soft and drapey, then go into the cloth room and start working. If it is tight-fitting, or I want a specific effect of that type, then I set up an animation first. Frame ten, the figure in default pose (or zeroed...you takes you pick here.) Frame one, dial down hips, breasts, make arms skinny, scale the entire body; whatever it takes to make them fully INSIDE the clothing. Then run the cloth sim...basically it's a shrink-wrap routine; you expand the figure into their clothes. When that's done to my satisfaction I export the NEW mesh (aka the clothing that has now draped properly around the figure). Now start from scratch setting up the animation that will get me into the final pose....aka at this point treat it as an ordinary dynamic item, Worth noting, at any point here I might have selected buttons or whatever (using select-by-material, usually) and taken them out of the dynamic group. Poser gives you a variety of other places to put objects that really shouldn't be trying to drape.