Costelloe designs mystery item for Royal Wedding

Irish fashion designer Paul Costelloe has confirmed he has designed something which will be worn at the Royal Wedding in London on Friday.

However, he refused to be drawn on the details of what the item is, or who will be wearing it.

Costelloe designed a number of outfits for Prince William's mother, Princess Diana.

And he said he believed Kate Middleton's mystery dress would be "very simple, long-sleeved, feminine, understated" to fit in with her image.