Pippa Middleton's $3,000 Bridesmaid Dress Is Finally for Sale.  Seven months after the Royal wedding, you can get your hands on the dress that caused worldwide hysteria. A version of Pippa's Alexander McQueen gown, designed by Sarah Burton, is being sold online. While the snug-fitting, cowl neck collar silk dress has been copied many times, this is the first from the actual British label, who also designed Duchess Kate's gorgeous wedding gown. This particular replicate is a carbon copy, except has a zipper back instead of a line of buttons. Many brides will no doubt opt to wear it for their big day, it has already sold out on the shopping website in UK size 4. The cowl-neck dress has become one of the most requested styles for brides across the country as many prefer the simple silhouette to Kate's more elaborate gown.