WELLINGTON, New Zealand—New Zealand’s national airline has adopted a cheeky way to encourage passengers to watch its in-flight safety video: The cabin crew’s uniforms are nothing but body paint.

The “Bare Essentials of Safety,” screening in the cabins of planes flying Air New Zealand’s main domestic routes, has gone viral online. It had 1.2 million YouTube views by Friday, four days after it was launched.

In the video, three cabin staff and a pilot, all in full body paint applied to look like their uniforms, talk viewers through the aircraft’s safety procedures.

A demonstration seat belt, life jacket and arm rests are strategically positioned during the 3 1/2-minute video to protect the cabin crew’s ... discretion. Passengers are shown ogling, mostly in appreciation.

The body paint idea is also being used in a series of television advertisements in New Zealand for the airline, which include the promise: “At Air New Zealand, our fares have nothing to hide.”