He also says the darker shirts are more practical.
"White shirts showed up everything!"
The uniform update is a pragmatic and cost-effective move.
"St John has estimated there will be a saving of about $400,000 over three years, including replacement and roll-out costs," he says.
He believes the new uniform will enhance frontline staff's ability to operate well while treating and caring for the public.
St John's last major uniform overhaul was in 2002.
New Zealand uniform and corporate workwear company Profile Limited will supply the uniforms.
In New Zealand ambulance services operate, 24 hours a day, seven days a week treating and transport approximately 400,000 people every year -- using ambulances, four-wheel drive vehicles, rapid response units, motorcycles and other specialist vehicles to ensure they can reach people at any hour of the day in almost any terrain, weather or situation.