When she announced she had finished chemotherapy in September, Kensington Palace only confirmed two engagements for the Princess for the rest of the year: today's service, and her annual Christmas Carol service at Westminster Abbey in December. No date has been announced yet for the Christmas event.

Kate Middleton was the picture of royal grace on Saturday as she gradually returns to her public duties after completing chemotherapy.

On the surface, her looks this weekend were classic Kate, but on another level, they marked a radical departure from her usual style.