U.K. company My 1st Years, which specializes in personalized baby gifts, shared the photo of the two-year-old prince meeting Obama and expressed disbelief as the $39 robe quickly sold out.
"We can't believe Prince George wore our robe to meet President Obama! Doesn't he look adorable?!" the company wrote. "You guys have gone crazy for it & it's already sold out."
Following its overnight success, the company opened a round of pre-orders for the item known as "Prince's Personalised Gingham Robe," which features gingham trim and can be personalized with up to 12 characters of embroidery for free.
Other aspects of George's wardrobe, including his shoes, also sold out.
George, who is third in line to Great Britain's throne, was allowed to stay up past his bed time to meet Obama before his parents dined with the president at Kensington Palace.