To be nude is to be seen naked by others and yet not recognized for oneself. A naked body has to be seen as an object in order to become a nude. (The sight of it as an object stimulates the use of it as an object.) Nakedness reveals itself. Nudity is placed on display.
To be naked is to be without disguise.
To be on display is to have the surface of one’s own skin, the hairs of one’s own body, turned into a disguise which, in that situation, can never be discarded. The nude is condemned to never being naked. Nudity is a form of dress.