Unless you're the one getting married, it's a faux pas to wear white to a wedding. It's rude; it upstages the bride; and it's supposedly bad luck. Plus, you're probably going to spill something on it (that last one might just be a me problem). Are there exceptions? Sure.
Maybe your house burned down leaving you with zero belongings but the white nighty you were wearing when you're house burned down, and you didn't have time to stop at TJ Maxx on the way to the wedding because you're already late because of your house burning down. That's the only one I can think of.
Spoiler alert: they did not.
Here's her story:
I'd like to start by saying that me and and my female cousin (blind from birth) aren't very close but we get along well as relatives. She's 26 and her wedding was last week. She sent me an invitation though we don't talk much but since I wanted a break from work I decided to go.