Thousands of Aussie swimmers have their eyes and bare bums set on breaking the all time skinny dipping record.

The world’s largest annual nudie dip, Sydney Skinny, is returning after a three-year hiatus.

More than 2000 swimmers are expected to plunge starkers into the water off Cobbler’s Beach in the city’s north on Sunday.

Event founder Nigel Marsh believes this year’s edition could have a stronger showing than the 2018 world record-setting swim when 2505 naked women participated in the Irish Strip and Dip.

“We think this is the year we might break some records and prove to the world how vibrant and spirited Sydney can be,” he said.

Every year, about 2000 swimmers brave Hobart’s chilly River Derwent during the Dark Mofo nude solstice swim.

In November, Sydneysiders also stripped en masse and swam at Bondi Beach as part of a large-scale artwork for renowned photographer Spencer Tunick.

Sydney Skinny organisers are hoping for a similar turnout on the event’s 10th anniversary.

“Our event is for everyone who wants to step outside of their comfort zone.

“If you’ve ever been apprehensive about doing something so daring – you will be looked after – and you’ll have the time of your life.”

This year’s swim is part of a collaboration with charity Skin Check Champions to help raise awareness of the importance of skin cancer checks.

Among the bare bathers will be Casey Burgess, former member of children’s musical group Hi-5. She will be swimming on behalf of her family members who have battled skin cancer and melanoma.

“Skin cancer has rocked my world countless times … That’s why I’m taking a dive,” she said.

“You best believe I will be wearing sunscreen all over my body during the swim.”

Beginner nude beachgoers can participate in the 300 metre harbour swim while more seasoned bathers can opt for the 900-metre plunge.

— AAP