I'm mostly joking about the nun and vow thing. The Japanese have a fairly strong anime history of ignoring actual nun things and details, and just treating it like another religion. Of course, that kinda defeats the purpose of being a nun, but well... I think there is a trope for that.
And nuns usually take vows of celibacy and sobriety, so technically there isn't one for shame. It's just kinda taken for granted (hence, the standard black nun full body robes).
My other thought is that she's in a secret slut-dress contest with Lutecia. ^_^
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