Celebrity Pippa Middleton Is the Best Dressed Party Guest in a Feminine, Flowy Frock By Olivia Bahou Olivia Bahou Facebook Olivia Solomon is a New York-based writer and editor who covers all things fashion, lifestyle, celebrity, and pop culture. She was previously the Assistant Digital Editor for InStyle, and her work has appeared in many national publications. InStyle's editorial guidelines Updated on July 18, 2016 @ 03:45PM Pin Share Tweet Email Photo: PA Images/Sipa USA Leave it to Pippa Middleton to pull out the perfect summer dress for every occasion. After wowing us in a fitted white number with graphic pink flowers at the first day of Wimbledon last month, Kate Middleton’s charitable younger sister stepped out for an event today in the ultimate feminine frock. Middleton looked stunning in the floor-length sheer floral piece, fitted with a tank slip underneath. She accessorized with a pink clutch and nude strappy sandals, styling her hair in loose, undone waves. The avid athlete was on-hand at the Frost Summer Party Fundraiser today in aid of the Miles Frost Fund and in partnership with the British Heart Foundation. The star-studded bash, held at London’s St. Leonard’s Terrace, was just one of Sir David Frost’s events in honor of his son, who died from hypertrophic cardiomyopathy. The fund raises money for research to prevent inherited heart disease. Pippa Middleton Climbs a 33-Mile Race Through the Swiss Alps for Charity Middleton is looking good and doing good at the same time.