Sean,

You look terrific. You could wear this outfit at any hour of the day or night, just fix up the details as we know you intend to do.

If it were an evening wedding, you could substitute a black bow tie---preferably a real one that you tie yourself ---and the Agyll would take you right to formal status. But that is not necessary. With the necktie, it's equivalent to a business suit, and that is "proper" for any black-tie occasion.

You can play with a different colored tie, white shirt, and so on. All would be fine, but you're just fine as you have begun. Well done!