A popular Adelaide nightclub has apologised for a controversial promotion that offered free drinks based on bra sizes.

The Woolshed on Hindley Street advertised the event on social media promising an allocation of free drinks based on bra sizes.

"The bigger the better," the crude and disrespectful post said.

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The campaign, which involved the bras being hung from walls inside the nightclub, sparked outrage online.

The club sincerely apologised for the post, which it said made some of its patrons feel uncomfortable and body shamed.

It said based on the feedback it had cancelled the promotion and all future campaigns would be reviewed by senior management to ensure they created an "inclusive environment" for all patrons.

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