I got it a couple of years ago now, when I went with my sister to the Vintage Fashion Fair at Eagle Farm Racecourse, an intense and magnificent event for your eyes and feet. There's so much to look at, I took a litre of Up-and-Go to sustain me during the day because this is one day of super serious vintage shopping. You have to be quick and not faff about too much with one stall. Bring lots of cash too: the atms are few and they charge for withdrawals. When the dress was found unfortunately I didn't get it to begin with. My sister nabbed it and refused to give it to me as she had a friend who she wanted it for, though she said I could have it if her friend didn't. Deeply wounded, I had to wait til she checked with her friend and finally when I had given up hope, she gave it to me several weeks later.
Found: Brisbane Vintage Fashion Fair (Eagle Farm Racecourse check dates:http://www.vintagefashionfairs.com.au/)