This is one of two stunt costumes designed by Ellen Mirojnick and created by Bill Hargate Costumes for Sienna Miller's stunt double, Sohphia Crawford. According to Sophia, this specific costume was used for harness work. While not pictured, it also includes the screen used gloves.
This costume can be seen during the Paris scenes in which the Baroness and Storm Shadow fell the Eiffel Tower.
