Touhou Shikieiki Yamaxanadu is one of the Yama who judge the dead to decide whether they go to Heaven, Hell, Hakugyokurou, or get reincarnated. One of her typical appearance is in the form of short green hair that is longer on the left side, blue eyes, and blue vest over white blouse and black skirt, with a blue and white hat with golden symbol on front.
As for cosplay touhou Shikieiki Yamaxanadu, this blue and black costume is the first choice for girls to be beautiful. Additionally, the design of this outfit is a good idea for girls who are into Lolita style clothes. If you have green wig, you could reuse it for cosplaying Shikieiki and then Gumi from Vocaloid and Ranka from Macross frontier and so on.