The “Kate effect” strikes again: This time it’s the striped shirt that Kate Middleton, the Duchess of Cambridge, wore Sunday to a charity polo match that caught the attention of fashionistas. The sleek top sold out in record time and already has a long waiting list for new orders, reports E! News.

The Me+Em Breton striped top is the latest fashion must-have, not only for fans of the Duchess’ style, but also for fashionistas and shoppers alike. The navy-inspired shirt retails for $75, and Me+Em already posted a notification on the product’s page that new orders won’t be filled until Sept. 18.  

The simple yet fashionable top is very versatile and can be mixed with other pieces to create a chic and casual look. Prince William’s wife typically partners the top with skinny jeans and, at times, with a smart-looking blazer. And on occasions when she needs to dress down, she would, more often than not, wear her favorite striped shirts, states People magazine. 

Aside from that, the simple top also appears to be Kate’s unofficial polo-watching outfit. Last weekend, Kate wore the white-on-blue striped top during the charity polo match at the Beaufort Polo Club in Glocestershire, England. During the previous year’s charity polo match, Kate wore a similar Breton top, though it was a blue-on-white striped design. 

The Duchess is not only known for savvy shopping but also for her love of recycling outfits, states the Express. Kate initially donned the blue-on-white Me+Em striped shirt during a sailing trip when the royal family visited New Zealand and Australia in April 2014. She was also seen matching the Breton piece with a navy blue blazer.

Kate Middleton wasn’t the only one who caused a fashion sellout from Sunday’s polo outing: Prince George’s shoes also inspired shoppers to snap up the blue-colored crocs.  The young royal wore comfortable kids’ clogs, called “Crocbands,” that retail for $30. The crocs have become best-sellers partly due to the “Prince George effect.”