Auto conforming - Super conforming - Crosstalk (go on swear ya know want to :P), it's called different things depending on software and age.

Basically the valueParm sections in the outfit has to exactly match the names of the valueParm sections in the base figure, one example from the MidiSweater.cr2 is "valueParm PBMGlutesSize", this is identical in name to the valueParm in V4, as a result V4's valueParm dial will take control over the valueParm in the outfit once it's conformed to the figure.

Problem is that Poser has a really crap way of identifying the components of each item you load into a scene, they get added into the CR2 when you save it back to the library, these identifiers will stop the item "auto conforming" if they don't match, they are also the direct cause of Posers dreaded CrossTalk.