Nudists to mark Anzac Day 

Descendants of Australian and New Zealand diggers will mark Anzac Day with a playful game of beach cricket near Byron Bay - in the nude.

More than 400 bare bods are expected to attend the annual nudist day at North Belongil Beach, hosted by naturalist group Free Beaches Australia, on Tuesday.

Pastor Bob Wright, a church minister who has been a naturalist for more than 17 years, said the event would be held with due dignity. He said the Anzac diggers had often played games of beach cricket in-between fighting on the battlefield during World War I.

Many contestants in Tuesday's game would be descendants of the original Anzacs, he said.

"The majority of the (players) turning up, believe it or not, actually had grandparents and great-grandparents in Gallipoli," Wright said.

"You never know, you might be meeting one of the descendants of your granddad's best mates. They are there defending their granddad's name."

Wright said although the event was lighthearted, the seriousness of war would not be forgotten.

He said diseases in the trenches of WW I and on the Kokoda Track in Papua New Guinea had often forced diggers to abandon their clothing.

"They would just walk around with a shirt on," he said.

"We are enjoying it as a leisurely thing - it would have been a different type of matter with those troops.

"It is something that people need to always remember."

The cricket match, which will force outfielders into waist-deep water, will begin at 10am (AEST) with the Australians defending their title against the Kiwis.

Up to 500 nudists and their families are expected to attend the event, which also includes a beach carnival, body painting, sausage sizzle and a fun run.

Police will be on call to prevent those taking unsolicited photos of the nudists.

Money raised goes to sun cancer research.