I'm pretty sure that many of the hairstyles she wear for PVs are wigs, the same goes for live performances. Although, during AT06, by what I remember, I think she only used one for the B&D performance.
I started thinking that this is the case after some video(s) I saw when she has a wig applied, and it looks so natural it's freaky. Well, her natural hair is wonderful and we see lots of it, but I think she wears a wig pretty often.
I don't think Ayus hair is thick enough to make a hairstyle like the my names WOMEN one.
