F&F Kate dress, at Clothing At Tesco. Photo: Clothingattesco.com

We think it may be time to quit our day job and start making blue wrap dresses.

In yet another sign of Kate Middleton mania, the $25 replica of the future royal's engagement dress sold out online just an hour after its launch, the Telegraph reports.

Offered by British retailer Tesco, the short-sleeved cotton F&F frock was modeled after Middleton's Issa dress, which also sold out within 24 hours of her engagement announcement.

But breath easy, royal wannabes. Tesco has confirmed that more stock will be added this week, though they expect to be completely sold out by week's end, according to the paper.

"Kate Middleton looked extremely elegant in her choice of outfit and many women wanted to find a high street replica of this now iconic dress," Tesco's Jan Marchant told the paper.

"The rate at which the dress sold out online is testament to how influential Kate's style choices are."

Um, you think? Now, if anyone needs us, we'll be figuring out how to DIY sapphire and diamond rings.

Meanwhile, Prince William and Kate Middleton have set a wedding date.