Register office followed by a meal with a few friends - so definitely not OTT- frills,flounces,or long dresses etc which all seem to me way OTT for a small daytime civil ceremony plus meal.
If it is high summer, maybe a tea dress, the sort of thing you might wear to a garden party or if it is changeable, then smart trousers, ballet flats or patent low heeled courts, a smart jacket - not matching ( or «kurta» length coat ) or tunic, not a hat - your aim is chic not shock.
Giorgia Meloni Gives Trump Both Barrels!
