The history of the Wallaby jersey is complex.

1899 - 1904, sky blue in Sydney, Maroon in Brisbane , 1905 - 1907, sky blue and maroon hoops, 1908 - 1928, sky blue except for Brisbane tests, 1929 - 1961, dark green except against South Africa, 1962 - 1976 gold, 1978 to now, gold with green. The South African jersey was chosen by accident. But has been green for 110 years. This article was written in 2016, from the ROAR;

The great history of Green and Gold: The Wallabies and Springboks jerseys (theroar.com.au)