Lightning Returns: Final Fantasy 13 trailer borrows the Miqo'te Garb
There's been a lot of swapping of costumes and characters between Final Fantasys lately. After Lightning popped up in Final Fantasy 14: A Realm Reborn, she seems to have taken a costume back with her, as you'll see in this new trailer.
Lightning Returns: Final Fantasy 13 is out in Japan in November 2013, and in the west in February 2014.