why disappointed? The OP could be wearing a white ball gown with a veil, it makes no difference to anyone but the bride and her.
Some posters having no experience of anything else convinced themselves that it cannot be a wedding dress. Well, I have seen a couple of brides wearing VERY similar gown, close enough that it would be awfully cringey to take a photo of the OP's dress next to them.
On that basis, it's an absolute no
added to the fact the OP HAS to ask in the first place
and 50% disagree.
Again, the bride won't be upstaged, might not care, but the OP doesn't come across very well, it's not about her, or any of the posters and that's the point many posters are missing, or chosing to ignore. 🤷