Image via Wikipedia
In the movie, after Sam (Garrett Hedlund) is transported inside the computer, he is dressed in his glowing battle gear by four living programs called Sirens. According to star Olivia Wilde, the process of getting into her costume was much the same. "I felt like I had my own Sirens, because I had this group of wardrobe experts who would come and put the suit on me." Wilde says it took 11 fittings to make sure that the costume not only looked good, but could accommodate all the stunts she had to perform.
Once the costumes were on, the actors had other challenges to deal with. Wilde had trained in martial arts and Parkour before filming, but had to relearn everything to accommodate the tall wedge heels on her character's boots. The batteries that powered the lights on the suits could only run for around 12 minutes before they died. The wiring for the lights was also so fragile that the actors could not sit down while fully dressed. Instead, special boards were built so the stars could recline while still vertical.