It's sad. At Comic Con, there was a girl who dressed like S. Brown's Batgirl every day, and every day, she went to DC pannels and asked about her, and all she learned was that she wasn't going to be in the Smallville comic.
Alright well with this being posted I'm just gonna say it. Go work for the costume designers at DC. Right now. Go.
I like the color choice and I'm happy that you kept her thigh belt. I don't know if this was your intention but I feel like this is a blend between her Robin and Batgirl costume what with the Robin like colors (minus the green) and the Robin like style of the costume but with a hint of Batgirl style in there due to the padding and spikes on the side gloves. Excellent job overall.