RedPhantom, Thank you!  Most older figures have their arms horizontal in the T-stance.  Your method makes it easy to deform their clothes.

MollyFootman, the Developer's rig do you mean something like LaFemme2's DEVTools?  O.K. I use it.

As a test, I tried deforming the LaFemme1 pants I made.  First I changed the pose of the pants' legs and used the morph tool.

"Fit" function in Fitting Room made bad result somehow, so I just made the pants a figure as it is.

I had to modify the weight maps of the pant legs.  No problem, I'm used to this kind of work.

I copied the Petite and Mini morphs from the figure.

This method allows users to more easily deform old figure's clothes that do not need to fit perfectly to LaFemme2's body.  And, I wonder if an item like tube top can be deformed only "Fit" function?  I'll try it later.