Surely if you just want to make a UV map of the existing clothing, as it is, you should use the obj file that is in your geometries folder. If you do it that way the map always fits and you don't need to save the obj. Its only if you want to actually change the mapping and remap that you need to do all that. Just my twopennyworth.

The greatest part of wisdom is learning to develop  the ineffable genius of extracting the "neither here nor there" out of any situation...."