Watch J Lo's Wedding Gown Transform Into a Thigh-High-Slit Halter Dress

A total of 30 copies were made for filming on set, since the dress changes throughout the story arc. The wedding gown's transformation mirrors Darcy's as she goes from pristine bride to shredded action star. Along the way, the dress collects varying levels of blood splatters and dirt — and the neckline is modified as well.

"I knew I wanted the neckline of the dress to transform and help her mobility as she begins her transformation from Damsel to Savior," he told POPSUGAR.