No wonder designers are so keen to send the Duchess of Cambridge their latest designs – as Kate has managed to cause another dress to sell out in a matter of minutes, by simply wearing it.

Kate was visiting a school in North London yesterday when she was photographed wearing her famous red Goat pencil dress.

This was the second outing for the gorgeous pleated dress, but that had no effect on Kate’s admirers who were quick to purchase the dress for themselves yesterday morning.

Matches Fashion revealed that red pencil dress sold out in matter of minutes.

But fear not, the dress is available still online (if you hurry) for €550.

It seems the Kate Middleton effect is as powerful as ever!