What does it mean when a woman wears white to someone else’s wedding?

There’s a well-known rule that as a guest you should never wear white to a wedding unless the dress code calls for it. I still however do see women who purposefully wear white to a wedding, even if they’re not that close to the bride/groom or even if they claim that they don’t want to get married. So why do some people go out of their way to still wear white knowing that they’ll get (negative) attention from doing so?

What does it mean when a woman wears white to someone else’s wedding?
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