I am working on this drawing

and I cant figure out what sort of costume to put her in, does anyone have any idea?
once I get a costume figured out I should be able to figure out the hair, if I cant figure out hair then I shall post again
you can also say what you think abuot hair if you have idea's =)
if anyone needs to know her name is Nani
I hope you like what I have so far, and any critisism/idea's/comments would be very helpful