@PhaedraTwo - if you read the thread though, half of people who have posted had the same thought.
Now, whether you 'see it' or not, would you want to be spending the day wearing a dress at what would generally be an elegant, 'dressy' occasion, knowing that at least half the people there think that is what it looks like, even if you don't see it yourself ?
The whole point of sharing what you are thinking of wearing on the internet is to get confirmation / validation that the dress looks good and is appropriate for the occasion. Now, whereas the response of "the internet" perhaps isn't what the OP was expecting, she will now have a perspective that she hadn't initially seen herself.
Obviously, she can still do what she wants about it, but you arguing that you can't see it doesn't invalidate the fact that many, many people had that thought pop into their head when they saw the dress.