I love the bridesmaids dresses.
As for the bride- I would try it on first.
I've married two times and never in white- the first was a liberty flower print dress down in 1975 when I was kind of a hippie bride (My husband had a white suit with bell bottoms and a green shirt with tiny white flowers )
The second time in 1995 I wore a black suit.

Now I sometimes think that I should have worn a real white princess dress the first time, thick silk satin, handmade lace or whatever- just because you will never have an opportunity again in your life

When you are young, it will make you look adorable. When you are older (like me the second time) it is not that much fun.

Why always be elegant and grown up and rational- it's one day in your life