With appearances at Royal Ascot and Wimbledon, Peter Phillips's girlfriend, Harriet Sperling, has become a firm fixture in the royal fold this summer. The stylish NHS nurse—who was given the ultimate stamp of approval from King Charles by riding in a Royal Ascot carriage—wore a pale blue linen skirt set while taking in the tennis championships last week, and on Friday, she brought out one of summer's biggest dress trends at the Royal Charity Polo Cup 2025.
Sperling joined Princess Anne's son at Guards Polo Club in a breezy ivory midi dress from St. Clair, a London-based label that's become increasingly buzzy among British it girls. I spotted numerous women in St. Clair dresses at Royal Ascot (and on the streets of London) this year, and Princess Kate's former personal assistant, Natasha Archer, regularly wears the brand.
