You can be sure there are only 4 costume options going through her mind:
- red devil horns, black dress
- bunny ears, black dress
- halo, fairy wings, black dress
- cat ears, black spot and whiskers painted on nose (black dress)
Clip something to my head, wear a black dress.
This is regardless of theme. If the theme is 'The Wild West', you can be damn sure there'll be at least two dozen girls that find a tenuous way to wear some devil horns or fairy wings. And if the theme is Halloween....it'll be exactly like the end of Being John Malkovich, except with more £2 halos.