That’s right – where there’s a sold-out item, there’s a score of savvy shoppers just waiting to swoop in and make some serious cash.

It seems as if plenty of people, predicting the dress’ widespread appeal, stocked up while they had the chance – and now they’re peddling them on eBay for double the price.

Some are even demanding £40 for the £15 frock – and they’re racking up the bids for it, too.

So we suppose this means that the world is now divided into four categories: there are those who bought the dress in time, and fully intend to wear it themselves this summer. Then there are those who, having failed to snag the frock of their dreams, are forced to think about paying through the nose for it on eBay. The third (and possibly the most enviable) category, of course, is made up of all those shrewd and calculating eBay sellers.

And then there’s the fourth category: those who had never heard of the dress until now, and really can’t see what all the fuss is about.

Images: Primark/Rex Features

Savvy shoppers, this Primark item is selling for over double its original price on eBay