How appropriate that Anastasia would be cosplayed by Russian cosplayer, Seiren-sama.
The Don Bluth film about the mysterious Russian princess didn't do as well as we had hoped, but it still holds a fond place in our hearts, as does its titular character.
This outfit is the dress Anastasia wears after she's reunited with her grandmother, the Dowager Empress, in Paris. Frankly, we prefer her commoner's clothes as Anya, but this is an amazingly-accurate outfit, topped by a jaw-dropping crown.
See more of this regal cosplayer on her Cosplay.com page.