In my post above, I suggested parenting the the Body of the hair to the head of the target figure. I now realize that was bad advice. You are better off parenting it to the chest. After posing the figure, save the pose to a Dot and apply it to the hair. This should get you somewhere near the ball park, but you will almost certainly need to tweak the pose of the hair.

Pictured above is the P6 "Long Hair_Evo_Jessi", parented to Antonia's chest.