A bride-to-be took to Facebook to ask for advice about a wedding guest's 'tacky' outfit choice, before the shocking scenario was then also shared to Reddit.
"I'm getting married in March and someone in my partner's family is wearing white even though we asked no one to wear white on the day," the woman wrote.
She explained in a second post the outfit in question is a "long white ball gown" style dress with "lots of detail", similar to this 'Eyes of the Beholder' white gown from Showpo.
"They are being very difficult and not willing to change it. I've said I don't want them there now as they are just looking to cause trouble... But I don't want to do that to my partner."
The bride ends up asking is she should just "drop it" and let the guest wear white on her special day.
Most people, however, agreed with the bride that wearing white to a wedding as a guest – let alone a ball gown style – was just "rude".
"I would not be happy either. It’s just SO RUDE and tacky," one person wrote.
"I know, a WHITE BALLGOWN?! What’s the betting it’s her future MIL?" another wondered.
"The fact that they’re fighting with the bride about this tells me it’s blatant and would NOT be allowed at my wedding," another said.
Some suggested to let it happen but make the person "regret wearing white".
"Orrrr if they do come to the wedding, tactical bridesmaid with some red wine," was one person's sneaky suggestion.
And another said they had seen a similar post previously and revealed the genius way the bride got around the issue.
"The bride switched to blush pink and put both mums in white, plus all the bridesmaids? Just saying, it's an option," they wrote.
Some of the links in this article may return revenue to Yahoo Lifestyle Australia.
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at email@example.com.