... d'you know, I'm still not completely sure Imitatio is Enorme, even with this.
Haven't we already seen Imitatio's non-magia form? In chapter 36, pages 4 and 5, the three girls appear to introduce themselves to Tres Magia in their normal forms, and then transform in front of them. And in chapter 41, Utena fails to recognize Imitatio when they first meet, but instantly recognizes her when she turns up in her cape for battle, suggesting that the two forms are separate.
I dunno, come next chapter I'm 10% leaning toward Imitatio just being like "lolno".