Rebecca as Luna in her dress from the third artbook that was made by Costume-net.com.

The wig is by SetsunaKou.

In the S movie, Luna became human to appear as Princess Kaguya, the fabled princess of the moon. (Well, the other one. ^.^)
Isn't she lovely?
Despite what the dub would have you believe, Sailor Moon and Luna are roughly the same age.
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