Alexander's daring sheer Azzaro Couture gown showed most of her chest, abs, left leg and back. The actress's stylist Emilie Pereira explained she knew the dress would be risky "but this one was a fashion risk she felt worth taking."
"Jaimie, Emilie and her seamstress were meticulous to ensure that proper measures were taken to so that there were no wardrobe malfunctions," Alexander's rep told E! News. "Jaimie felt extremely confident in the gown or we would have gone in another direction."
The rep added that the 29-year-old decided to go with the dress because she knew she was in great shape.
"One of the reasons she embraced the gown was due to her extensive training to reprise her role as Lady Sif; the sole female warrior amidst a legion of strapping men," says the star's rep. "She takes her health and fitness very seriously and opted to flaunt the results accordingly."
"I started training two months in advance [of filming] and a lot of weight training," the actress said at the premiere. "But more so this go around, I also did a lot of yoga and Pilates because I needed to be very flexible and do a lot of martial arts."
Swim Week Miami Beach 2014 [PHOTOS]