I am going to make the following comments into a graphic tutorial so that you may understand what is involved in converting clothing from LF2 to LF or LF to LF2.  In the following example, I will be converting a pair of LF2 leggings to LF using the Prefitting tools provided in the La Femme Pro package.  Start with a new scene with no figures or props.  Load the Prefitting tool into the scene and nothing else.  The image below should represents what you should be starting with.

The prop should be in a default zero position with feet on the ground.