Another way of converting dynamic clothes from one figure to another is to convert them into conforming clothes and convert the conformting clothes. I don't remember the exact settings, but if you open the setup room, this converts the dynamic clothes into a figure. You can then save the figure, convert it using crossdresser (I suppose wardrobe wizard might also work), open the converted clothing, export it as pjz99 says, and then import it again. It is necessary to export and then import to get it back into being a prop.