With Christopher Nolan's Batman trilogy officially over, I'd say the door has opened for fans to make an 'expanded universe' of sorts. I thought up this character design for a Batgirl that would hopefully fit in Nolan's universe of this version of the Dark Knight.
The suit is a 'militarized' version of Batgirl's costume that looks flexible and functional, similar to Batman's suit in the movies. I took out some elements that it used to have that would make the design stealthier (e.g. no bright yellow gloves/boots, purple cape like in the comics).
Just as how John Blake seems to be a subtle amalgam of all the Robins' (Dick Grayson, Jason Todd, Tim Drake) traits/backgrounds, I would like to imagine that this Batgirl's character combines elements from Barbara Gordon, Cassandra Cain, and Stephanie Brown together. Don't know how that would fit together though...maybe some brilliant mind can work on that.