that sold for an astonishing $125,000. kate's outfits are the envy of all. her recent outing in a burberry coat sent women in a frenzy, selling out within hours of her appearance. some style experts say it all started with a certain engagement. >> the three things that work so perfectly with the dress was the fact that the color was the perfect regal blue. she showed cleavage but it wasn't too much. nipped at the waist shows off the figure but then skims the body so a lot of women can actually see themselves wearing it. it's a very flattering dress. >> reporter: the issa dress was designed by daniela, a name now synonymous with kate's engagement. and perhaps kate's wedding day. >> terms of the wedding dress, this is the biggest best-kept secret of the royal wedding. it's going to stay that way until the 29th of april. i think one thing we can be sure of, copies of that dress will be made as soon as she's captured on camera. >> that's a nice shot. commenting on their photos. they look lovely.