use the magnetise poses.  then rummage around for the deformer strength dial, that can sometimes help. Almost all the DAZ stock movement morphs on the chest area are based on these deformers, which means without the deformers applied to the clothing you will have trouble making her shirt and chest move together.

Generally if the clothing has been made correctly (ie designed to work with the joint deformers) then everything should stay where it is supposed to. However not all clothing makers can or will do this. So good luck

 

'superconforming' is a term that refers to a certain kind of internal coding... which has pretty much nothing to do with your issue and is actually sort of obsolete with the new morph conforming option in poser

 

LM