A nine-year-old was punished by her school for wearing "form-fitting" clothing.

A US school has been accused of sending home a nine-year-old girl for wearing clothes deemed “form-fitting”.

The incident gained international attention after the girl’s uncle made a furious public post to Facebook.

Robbie Nettles from Mississippi shared images of his niece in the ‘offending’ outfit, alongside the details of what had occurred.

“Does my niece’s round belly OFFEND you? Obviously, her attire was too form fitting,” he said.

“It was offensive enough to get her sent to in-school suspension at Brookhaven Elementary School. Apparently, it is acceptable to body shame a nine-year-old.”

Nettles went on to share how upset he was to see his niece’s school value her appearance over her intelligence.

“It sickens me to imagine my sweet niece going to a school that cares more about her weight than what is in her mind,” he said.

The concerned uncle said his niece was sent to in-school suspension instead of waiting in the office for “more appropriate” attire.

“They could have made her wait for a new outfit in the office. Instead, she was sent directly to ISS,” he said.

The post has already attracted tens of thousands of supporters, with commenters sharing their sympathies for the girl.

“This is ridiculous punishment. She is adorable and dressed just fine,” one user said.

“Girl, you look fine. You keep your head held high and keep walking – that was not called for by no means,” another user said.

Feature image via Facebook.

Listen: Liane Moriarty’s Big Little Lies is required reading for all school mums. Listen to the Book Club’s review here.