Royals Princess Kate Changes Into an Unexpected White Dress with 'Another' Plunging Neckline for Polish Garden Party Princess Kate is going geometric! By Erin Hill Erin Hill Erin Hill is the Senior Editor, Royals at PEOPLE. She has reported on Royals for the brand since 2015. Erin previously worked at PARADE Magazine and The Knot. People Editorial Guidelines Published on July 17, 2017 04:19PM EDT Princess Kate is going geometric! After arriving for a busy day in Poland in a white Alexander McQueen peplum skirt suit, the royal mom changed into another white ensemble — a bold gown with asymmetric black piping and a plunging neckline (reminiscent of her daring pink lace Marchesa gown from the Spanish State Banquet at Buckingham Palace last week). Kate paid homage to her host country by choosing the dress by Polish designer, Gosia Baczynska. She accessorized the edgy look with a daring pearl necklace and matching earrings. Zak Hussein/Splash News Zak Hussein/Splash News Prince William and Princess Kate capped off the first day of their royal tour with a special garden party in honor of the Queen’s birthday in Warsaw’s Łazienki Park. In a speech, William said: “Tonight we have double reason to celebrate, we mark the birthday of my grandmother, the Queen and we mark the depth and breadth of our two great shared countries.” He started and concluded his speech in Polish, to the delight of the crowd of over 600 special guests, includingPresident Andrzej Duda, First Lady Agata Kornhauser-Duda and British Ambassador Jonathan Knott. He also passed along a touching message from the Queen, who turned 91 earlier this year, and Prince Philip, who sent their “warmest good wishes.” FROM PEN: What’s Next for Princess Charlotte On Tuesday, Will and Kate will make a poignant visit to the Stutthof concentration camp, where they will meet with Holocaust survivors.