A dark-elf from Thor: The Dark World, reimagined! From what I recall from our conversation…
The draping sleeves were inspired by Arwen’s battle dress—created for The Lord of the Rings: The Two Towers for the sequence with “The Battle For Helm’s Deep”. Apparently, Arwen was to hold the bridge during this battle, but the directors later decided that it did not fit her character (a decision the cosplayer agreed with). Still, the dress was magnificent, and the cosplayer felt inspired by it, and tells the tale to those she can.
Oh and you can totally still see Arwen in the background during the battle here and there, as they had already filmed with her in it. There are some pictures of this online, or you can watch yourself.
I wish she provided me with a website/blog to link you to, but I’m afraid I am lacking in this regard. I ran into her again on Sunday, though, and she had another cool cosplay to show.