Prince George marked a major milestone on Tuesday, as he began his first day at Eton College. The heir to the throne, who recently turned 13, was accompanied by his parents, Prince William and Kate Middleton, on the rainy day. The Princess of Wales wore a long green dress for the occasion, and accessorized with a gold necklace. Both William and Kate carried umbrellas with them. The Prince and Princess of Wales walk with their 13-year-old son, Prince George, as he arrives for his first day at Eton College on Sep. 8 in Berkshire, England. WPA Pool via Getty ImagesThe family was all smiles as they escorted George on his first day. ADRIAN DENNIS via Getty ImagesThe Wales family are met by headmaster Simon Henderson (second to the left) and provost Nicholas Coleridge (left).WPA Pool via Getty ImagesGeorge arrived in a suit and tie, and the palace later shared photos of the young prince in full Eton uniform.The traditional uniform consists of pinstriped pants, the school’s iconic black tailcoat, a shirt with a white collar and a coordinating ribbon tie.Matt Porteous / Kensington PalaceMatt Porteous / Kensington PalaceBoth Prince William and Prince Harry attended Eton College, with William attending from 1995 to 2000, while the Duke of Sussex went from 1998 to 2003. Below are photos of the princes during their time at the school: Prince Harry in his bedroom at Eton College. Pool/Tim Graham Picture Library via Getty ImagesPrince William at Eton College wearing a Union Jack flag waistcoat. Tim Graham via Getty ImagesPrince Harry, the then-Prince Charles and Prince William pose for a photograph at the confirmation of Prince Harry at Eton College on March 19, 2000, at Eton, England.Anwar Hussein via Getty Images