Quote:
Originally Posted by ohsixthirty
why don't they change costumes or hairstyles...? well its obvious i think, why would you mess with perfection???
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LOL. YES.
But yeah, they
do change outfits with every tour and occasionally hairstyles... just obviously not as drastically as Ayu, but she's kind of a special case, wouldn't you say?
Just while skimming over Eneabba...
They do stay black, yes, but I think that's just a standard for back-up singers. Definitely not as drastic, but they do change

As someone above said, they probably keep similar motifs throughout so that they're more easily recognizable.