I really like the second one, but I think what makes it, is that the champagne colour underneath shows the beautiful lace. In ivory, I think it would take away that element, which is the prettiest part. I'd go for dress 1 because of that.
I prefer the second dress. However, I agree with having the lining in ivory instead. The pattern is quite busy against the champagne color. But I think it will create a better balance with the ivory color underneath. You’ll still see the pattern. But it will tone it down a bit.