I don't think royal weddings are a very good example. As you have alluded to, there is quite a bit of choreographing and organising of that kind of thing behind the scenes.
Also, royal brides usually end up with their image on commemorative tea towels, tea cups and so forth. I don't think there is really any risk of a royal bride feeling not noticed on the day!
At the end of the day, it really isn't that hard to find something that isn't white or cream so why push it. I think the ops is borderline ok because of the pastel patches but, like others, I do think it is possibly more a sundress for a summer party than a wedding, but then that depends how formal the event is.