I like the pearl detail. Hints of Audrey Hepburn.
Looks lovely from the back. So does your hair and the hat.
I really don't like the big bow. It swamps you. It looks fussy and too much, hides the shape of the dress actually and you have a good figure. Get a dark blue sequin clutch instead (not too big)
Does the dress fit you exactly... the right lenght? would that make a difference.
Lose the gloves - too Royal Family circa 1980s
and it shortens your arms for no reason. Why do you even need them.. Get some delicate bracelets instead, some silver mixed with gold.
The shoes don't match at all.. Also quite a fussy pattern on shoes at the front. More suitable for a summer dress. It would probably be more elegant to have the same colour shoes. maybe covered at the front, kitten heel, slingbacks, If you went for strappy, then just horizontal straps in a matching colour would look more together.
If its an indoor or mostly glam evening type of wedding.. I think it would be good. If its an out in the sunshine or beach wedding.. not quite the right theme.
But Victoria Beckham when through a spell of wearing dark Navy dresses to weddings... so its not that out of the park .
But if you are in a lot of minds about it.. maybe keep looking.
Also. Is your DH really a fashion expert?