On Monday, Blue Mountains Leisure Centres (BMLC), doubled down on its ban on the cheeky swimwear style at its facilities, which include Katoomba Sports and Aquatic Centre, Springwood Aquatic and Fitness Centre, Blackheath Pool and Glenbrook Swim Centre.

The centre's terms of entry state that “patrons are encouraged to shower thoroughly before entering the pool and recognised swimwear must be worn”.

It goes on to clarify that, “Recognised swimwear does not include G-strings”.

The reiteration of the ban comes after the centre was forced to explain what it meant with a sign that read: ‘'revealing swimwear/things' were banned.

On Facebook, BMLC wrote: “We’ve seen there’s been some confusion about what’s appropriate swimwear when you visit a Blue Mountains Leisure Centre pool,”

“The image of 'Revealing Swimwear/Thongs' has raised some eyebrows, this image refers to thongs and g-strings not bikini tops and bottoms,' the post reads.

“Bikinis are acceptable and considered recognised swimwear.”

However, locals aren’t happy with the ‘outdated’ ban on swimwear and flocked to the social media post to share their opinions.

“This policy is so old fashioned and outdated in my opinion”, one user wrote.

“So long as practically and safety are considered it shouldn't be any one else's business what I'm comfortable swimming in,” one commenter said.

“How about we solve this by placing the responsibility with the person having feelings about somebody else's clothes and not the kids wearing them,” another suggested.

Another simply said, “If you don’t like it, don’t look.”

“If someone is so offended by a cheeky G string bikini, then don't wear one and don't look at others wearing them,” another added.

One commenter pointed out that ,“people go to the pool to SWIM and not to worry about what other people are wearing”.