The outfit that Prince George wore to his little sister Princess Charlotte’s christening to St. Mary Magdalene church on Sunday sold out in less than 24 hours. The toddler was the epitome of cuteness as he turned up to the event in the ensemble. The outfit consisted of red shorts and embroidered shirt by British designer Rachel Riley.

The outfit in sizes for 12-month olds and 18-month-olds has been sold out completely on the company’s online store on Monday, according to Hello. There are only some stocks left for the royal look in the 3-month and 6-month size. Rachel Riley has been a favorite designer for Kate’s children. George wore a pair of sailboat overalls for his first public engagement a play date in New Zealand last year.

George’s outfit was almost identical to the one that Prince William wore when he first met baby Prince Harry in September 1984. Royal fans were quick to note the similarities between the outfits, prompting speculation that the little royal was wearing his father’s original look. However, there are slight differences including white buttons on the shorts and a different embroidery pattern.

Little George was the spitting image of his father in the sweet ensemble, as he walked hand-in-hand with William. Kate and William’s mini-me looked bemused at the crowds of cheering fans, as he waved to them. He walked beside his dad and mom, who were pushing Princess Charlotte in a pram.

It’s the second time in recent weeks that George has sported a retro ensemble. He wore a blue outfit identical to one his dad William wore at the same age for the Trooping the Color parade last month. There is always a spike in sales when the little prince is spotted in his adorable outfits. Royal watchers and the industry call his sartorial influence ‘the Prince George effect.'

Most recently his Crocs’ Crocband shoes in navy sold out after he wore them for a day out at the polo match with the Duchess. “Since the HRH Prince George was spotted wearing Crocs’ Crocband shoe in navy, our size 2 sold out immediately! The shoes have since become a best-seller, thanks to what we’re calling the ‘Prince George effect’,” said Crocs’ U.K. and Ireland Country Manager Scott Lucas.