Yes, those conform poses files are very useful. The only thing left is getting the mesh to scaled to fit the figure right. Sometimes almost no scaling is needed, other items may need more. You can do that any of a number of ways. This thread started out on using P5 to scale clothing to fit. That is just one thing that has to be done, you then have to get it to conform right. The pose file handles that most of the time. There are a number of ways as well to get the clothing, once it is conformed right, to fit. Using magnets is one, and converting them into morphs. Or, you can scale it, and export it as an object as was described here. Again, much depends on how you want to go about it, and what you need it for.