Can Guest Wear White?

I was watching The Real Housewives of NY and there was some big talk about Ramona & Alex wearing white to the wedding. What do you think can guest wear white to a wedding? I don’t think so maybe old fashion but I think it should just be the bride. Tell me yes or no wearing white to a wedding? What would you do if your guest showed up in white?

Side Note: The illustration is one of my plus size designs coming soon.