Hailing from Brisbane, Grbac developed a love of fashion at a young age and was taught to sew by her mother, who also worked as a dressmaker.
Upon her return from London, she worked as a hand sewer for various companies, including luxury brand Easton and Pearson, before starting her own label "Grbac" in 2002.
Grbac also opened a stand-alone store in the TC Beirne Centre in Fortitude Valley's Brunswick Street Mall, which closed two years later.
As part her Project Runway Australia prize, Grbac had her designs modelled at the L'Oréal Melbourne Fashion Week in 2009, which received rave reviews, as well as a 6-page spread in Madison magazine.
The new uniforms, which included a women's red shift dress and a men's three piece suit, were unveiled that year with a catwalk show featuring Elle Macpherson and 60 Virgin Australia crew members.