I'm more interested in why they are wearing whites in a ODI?
History of coloured clothing in ODIs is very interesting, but I'll try to keep this short.
India vs Zimbabwe in December 2000 was the last ODI series where white clothing/red ball was used. After that, since January 2001, it became mandatory for all ODIs to be played with coloured clothing/white ball.
The last time Australia wore whites in ODIs was on the 1998 tour of Pakistan. But, during the '80s and '90s, it was very common for ODIs in the subcontinent to be played with white clothing/red ball. I guess it was a convenience thing to keep production costs down for the touring sides, but somewhat weird as in India, ODI tournaments would alternate between white clothing/red ball and coloured clothing/white ball. For example, when Australia toured India in 1996 for the first time in 10 years, the Titan Cup ODI tri-series between India/Australia/South Africa was in coloured clothing but when they toured there again in 1998, the ODI tri-series between India/Australia/Zimbabwe was in whites.
Sharjah tournaments didn't use coloured clothing until 1997 (the year England won it).
Since Packer's World Series Cricket in the late '70s, Australia was the first country to use coloured clothing/white ball although in official ODIs, full coloured clothing didn't happen until the 1980/81 season. Although the white ball was used in the first ODI tri-series held in 1979/80, Australia/West Indies/England didn't wear full coloured clothing that series but played in whites with only coloured outlines on their clothes, as the English Cricket Board protested and said coloured clothing in cricket was not in the spirit of the game. The ECB made a big stink about it, and maybe it was their way of protesting against the Packer establishment and ideas that were used in World Series Cricket as they were completely against him. England didn't use coloured clothing until 1998 - a year before the 1999 World Cup was held there - and day/nighters until 2000, so it shows that they were definitely traditionalists and took a long time to accept any change. Even the BBC coverage only broadcast live from one end like it was pre-World Series Cricket right up until the late '80s (with the camera footage from the other end only used if it was a replay of a front-on view rather than behind the batsman). So, Packer was ahead of his time, as all the other test-playing nations (and tv broadcasters in those countries) eventually adopted his ideas.