No, it's not appropriate. Storytelling is often a social or family - related activity. Nudity in such a situation violates the basic social norms of decency. It can make others uncomfortable and goes against the traditional values of most cultures that emphasize appropriate dress and behavior in social interactions.
Well, in general public or family settings, this is completely unacceptable. Storytelling is a normal communication activity, and nudity goes against the norms of modesty and propriety that society upholds. However, if it's in a very private, consensual, and artistic context within a relationship where both partners are comfortable with such an expression, it might be a different matter, but still not a common or widely acceptable scenario.