Can you upload a few pics of the dress? I thought about Gothic Lolita, or, if you wanted to spend money on a wig, Nia Teppelin from the end of episode 27 of Gurren Lagann.
[~Future Cosplay Plans~]
Dipper Pines [Transcendence AU - "Alcor the Dreambender"] (Gravity Falls) - 80%
Unbeatable Squirrel Girl (MARVEL) - 35%