The "easy way" is so simple that nobody mentioned it.

Load your heavy morphed figure.

Load and conform the clothing.

With the clothing selected, open the morph brush and create a new morph. Use the fit brush "with your morphed V4 set as goal and with a Poketrough margin of about 0.002", to paint over the conforming clothing. => The result is a perfect fitting clothing in a single morph. This works best in a neutral "T" pose to avoid issues later on when posing.