Royals Kate Middleton Just Wore a Mystery Dress by a 'Private Dressmaker' — Just Like the Queen The Queen also wears dresses and ensembles from private dressmakers By Erin Hill Erin Hill Twitter Senior News Editor, PEOPLE People Editorial Guidelines Published on March 5, 2019 01:27 PM Share Tweet Pin Email Kate Middleton is following in Queen Elizabeth’s stylish footsteps when it comes to her latest look. The royal mom of three wore a beautiful pale blue dress with ruffled sleeves and a high neck with button detail to a palace reception on Tuesday. But the dress isn’t from one of her usual designers, it’s from a “private dressmaker,” according to sources. Dominic Lipinski/Pool via AP The Queen also wears dresses and ensembles from private dressmakers. The monarch regularly wears colorful creations from her royal dressmakers Angela Kelly and Stuart Parvin. Queen Elizabeth arrived at the palace party, which she threw in honor of her son, Prince Charles’ 50th anniversary of his investiture as Prince of Wales, in a purple ensemble by Parvin. The identity of Kate’s private dressmaker remains a mystery for now. See Meghan Markle and Kate Middleton Reunite at the Queen’s Palace Party for Prince Charles Between Kate’s ethereal blue dress and Meghan Markle’s floral-embellished brocade dress, the royal sisters-in-law were ready for spring. Kate paired her look with her diamond and aquamarine drop earrings and carried a matching blue bespoke clutch. Meghan topped her dress off with her Amanda Wakeley white coat and wore jewelry from go-to designers, Pippa Small and Maison Birks. Dominic Lipinski - WPA Pool/Getty The royal family gathered together on Tuesday at Buckingham Palace to pay tribute to Prince Charles as celebrations begin for the upcoming 50th anniversary of his investiture. Although Charles was made Prince of Wales at the age of 9 in July 1958, his official ceremony didn’t take place until July 1, 1969, at Caernarfon Castle in north Wales. The party came amid a busy week for the royals. Prince Harry was in Birmingham on Monday, while Prince William opened a theater in London. William and Kate head to Blackpool on Wednesday, and Meghan will host a special panel in honor of International Women’s Day on Friday. All four will be reunite again next Monday when they join the Queen, 92, for a service to mark Commonwealth Day at Westminster Abbey.