Hi, I'm going to a verrrrrry fancy wedding next month. I've only been to 2 weddings that were far more casual than this one so don't have a lot of wedding experience.
I've seen this dress and all my friends (who are going) have said its lovely etc.
Then I showed my sister who said she'd kick me out if I turned up to her wedding in it 

So..... I'd like some impartial views please, incase me friends are setting me up for a roasting!