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The original was posted on /r/AmItheAsshole by /u/CharacterTart7612 on 2023-09-22 05:57:38.

I (27 M) recently got married to my wonderful husband. It was a small wedding with just our family and closest friends. My husband and I both love space, so we decided to have a space themed wedding. We had star decorations, a galaxy marble cake, and fairy lights. I even wore a tux with little white stars. My sister (32 F) was invited to be the ring bearer as she and I are very close. However, when she showed up at the wedding, she was wearing a Halloween costume of Saturn. She was literally dressed up like the planet. We made it very clear in our invitations that this wedding was strictly formal. My sister and I joke around a lot, so I laughed about it and asked her to get ready as the wedding was starting soon. But she fully planned to bring us the rings in her Halloween costume. She refused to change into a serious outfit, saying that our family would find it funny because Saturn has rings and she’s the ring bearer. This was the most important day of my life, and I expected her to take it seriously, even though we often joke around. So I told her she could change or she could leave. She called me over dramatic and left. AITA?