The fan theory has been doing the rounds for several years now and has held true in all seasons but one - Nick Cummins', which we'll say is an outlier. Other than that, the theory holds weight.
In 2017, Laura Byrne was dressed in white while runner-up Elise Stacey was dressed in a darker shade of gold. The year prior was Richie Strahan's season and in the official final two promotional shot, Alex Nation cemented her place as the frontrunner wearing a stunning light gold gown as opposed to Nikki Gogan's vibrant red dress. Next was Sam Wood's 2015 season, which saw Snezana Markoski dressed in a white beaded gown (much like a wedding dress) while Lana Jeavons-Fellows wore silver. Even in Blake Garvey's controversial season, the "dress theory" proved true as Sam Frost was proposed to while wearing a sparkling silver dress while runner-up Lisa Hyde was in a plunging jet black gown.
This even goes as far back as season one, with the OG Bachie Tim Robards picking now-wife Anna Heinrich who was dressed in a light-coloured beaded ensemble while Rochelle Emanuel-Smith wore a bright pink dress.
We'll have to wait and see!