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Blue engagement dress
Blue engagement dress
The royal blue dress by British label Issa that Kate Middleton wore when the royal engagement was officially announced created such a shopping frenzy that the same style sold out in London 24 hours later.

According to Google, searches for the blue dress peaked in November right after Kate wore the dress. Since February, searches for "Issa dress" are up 10%.



NEXT: Royal wedding parties
Last updated April 19 2011: 11:47 AM ET
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