This dress was made by MailleTec.com using of course our scales.
There is a post on Facebook with lots of pics including some of the process.
The dress was originally designed to be worn by Julianne Moore but she vetoed it when she tried it on. It took months to make and some extreme scalemail skills by the best in the industry - but it was cut. It appears as set decoration in the film. It has since been donated to The Museum at FIT in NY (Fashion Institute of Technology)
Since the dress was vetoed Dane Duncan of MailleTec.com went to the filming location and custom made the black scalemail bodice referred to as the Double Vertebra Dress.