Thanks for the info, were definitely not into the formal dining, so will stick to the buffet for that night, my wife is gluten intolerant so felt we might have to lean towards the restaurant, meeting maitre-d once boarded.
so hopefully the buffet will be fine, we eat by 6pm latest, so that late restaurant sitting just doesn't suit us.
As it's our first cruise, I have chinos and jeans, but prefer to be in jeans and a polo shirt, so hoped we could dine like that, seem to be taking so much clothes because it's colder, didn't want to take even more.