According to the New York Times the 228th wore Khaki-colored uniforms
"Taking the ice, the hockey-soldiers of the 228th Overseas Battalion of the Canadian Expeditionary Force wore khaki-colored uniforms, just like their brothers-already-at-arms along the bloodied Somme River in France. Known as the Northern Fusiliers or just plain Soldiers, this was, briefly, one of hockey’s best teams."
https://www.nytimes.com/2016/12/30/s...ultPosition=22