I just quickly converted V4 bodysuit to La Femme and nearly got a very close fit although I got poke throughs under the arms and behind one calf. In this case, hiding body parts will alleviate the problem. If I wanted an exact fit then before taking the clothing to the fitting room, remove the poke throughs with the morphing brush. if need be, using the V4 bodysuit morphs to closely match La Femme. Once in the Fitting Room, reduce your iterations to 10 and work your way up. Iteration 40 is too much and will deform the clothing.

Edit: There are other morphs to help fix the clothing. Consider loading those also into the clothing.