If the clothing is a Figure, then you can only "Conform to" for it to work. Parenting won't match the human figure->clothing body parts so that posing the figure moves the clothing along with it.  Are you sure that the clothing is a figure?  And is it selected with the target human figure already existing in the scene before going to the Figure menu?

It could also be a Dynamic Prop which needs to be parented and then run through the Cloth Room.  Think of this as a complicated (but more versatile) way to have clothing move with the human figure to which it is parented.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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