It was chosen from among a range of entries, including one ensemble inspired by the Sydney Opera House and another inspired by Steve Irwin.
Tegan had a chance to distinguish herself however, when it came to the National Costume Show.
Scroll down for video Keep smiling: Ever the professional, Tegan barely broke composure as she smiled for the cameras despite the wardrobe malfunction Despite the debacle, the blonde was ever the professional and laughed off the embarrassing mishap.
Get Me Out Of Here! Myer face Jennifer suffered a similarly red-faced moment in 2004 when she was walking at a catwalk parade at a Westfield Shopping Centre in Sydney.
Tegan and Blake are currently enjoying a lavish holiday in Fiji.