This is pretty fantastic - the Australian women will be deviating from their standard green and gold attire for one match against the Argentineans at the upcoming Champions Trophy. From the WorldHockey article:

“Sue Murray, CEO of the NBCF, encourages all sports fans to get behind the Hockeyroos on Pink Ladies Day. “We’re thrilled that the Hockeyroos will be playing in pink to raise awareness of breast cancer research. With one in nine women expected to be diagnosed in their lifetime, it’s vital that we keep funding research into the prevention and cure of the disease. Research has shown that regular exercise can decrease the risk of breast cancer, so this partnership also sends a message to the community to embrace a healthy and active lifestyle.””

International Hockey Federation : Full Story.