That would depend on the kind of clothing being used. If it is a prop (such as dynamic clothing) -- parent it. If it is a figure (in your Character library) -- conform it. parenting = select clothing, Object -> Change Parent... conforming = select clothing, Figure -> Conform to...

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)