Reuters

The white Nanette dress Kate Middleton wore in the official engagement photos is no longer in stock.

She may have stylists galore at her disposal, but if her fashion is any guide, Kate Middleton lives up to her reputation as a regular girl.

In the official engagement photographs released over the past weekend, Prince William’s fiancee is pictured wearing what’s known locally as high-street fashion – basically, clothing from stores found in any U.K. shopping area or mall. Hardly the designer digs one would expect from a princess-to-be.

The white Nanette gown she wore in the formal photo, for example, comes from British retailer Reiss, and is said to have sold last season for about $250, while the white “vintage-inspired” silk top she wore while wrapped in Prince William’s embrace sells for about $150, according to the Daily Mail newspaper.

Kate also did her own makeup for her engagement portraits. "Kate had already done most of her makeup the way she wanted – she wanted to look very natural," a source tells UsMagazine.com.

Since the engagement was announced, Kate has become the woman to watch on Britain’s style scene: Anything she’s pictured in is almost guaranteed to send sales soaring. For Reiss, this has meant a real uptick in traffic since the photos were splashed across the front page of nearly every U.K. newspaper last Sunday.

Reiss

The white Nanette dress Kate Middleton wore in the official engagement photos has sold out, but British retailer Reiss will have a new version available next month.

But in what’s sure to be considered a stroke of bad luck, the Nanette dress is no longer available in stores. The retailer, which has nine stores in the U.S., is scrambling to meet the newfound demand, and will have a new version of the dress available in January 2011. Whistles also plans to re-release its white silk blouse in early 2011.

“Kate has been a customer of Reiss for some time now and we are absolutely delighted that she chose to wear one of our dresses for such a wonderful occassion” said David Reiss, founder and managing director. “We wish both Prince William and Kate Middleton all the best for the future.” And for those who can’t wait another month for the future, a recent listing on eBay featured the dress, with tags still on, selling for about $715.

Last month, retailers saw a run on the royal blue Issa dress Kate wore to announce her engagement. At about $715, the dress sold out and instantly. Within days, it spurred knockoffs from value retailers, like Tesco, which is selling its “Kate dress” for about $25.

For more about Kate's style, watch the video: