[Cade looks down at his clothes. He even tugs at them. They seem real enough to him. You may or may not note that when he tugs on the invisible clothes, his skin does move accordingly, even though he appears to be tugging on thin air.]

"Disappeared? They look fine to me..."

[He grins at you, and talks as if you are making a joke and he's just now getting it.]

"Are you trying to play a practical joke on me?"