You need to load and conform clothes before posing the main figure. Then the clothes will pose with her. You will still, in some poses, get "poke-through" of body parts. This can be fixed either by painting in postwork, or by making certain body parts invisible. (To do this, select the body part and then on the Properties box, go to the second tab and uncheck "visible".)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire