I'm not sure if there are any specifically for Blender, but there probably are a million tutorials on making clothes for poser and some of them must address this issue. Try crossposting in the poser forum. Pictures of the mesh and the problem would help, too! That way we can make specific suggestions. You might also want to import some clothes that do work into blender and see how they differ from yours. Using the original torso as a template may not be such a hot idea, there could be copyright problems and the vertices just aren't where you need them to be a lot of the time.