Issa Dress
Credit: Samir Hussein/WireImage; AKM-GSI

The royal blue Issa dress Catherine, Duchess of Cambridge made famous when she announced her engagement to Prince William in November 2010 is back again! This time, it's on her little sister. Pippa Middleton chose the same flattering wrap design to attend her friend's wedding in Scotland this weekend, only in a raspberry red color, and added a matching black and rose floral fascinator. Ironically, when Issa reissued the design in the different hue, the label made a nod to the elder Middleton's big moment, naming it "Royal Engagement Dress" (available for $555 at Of course, Pippa could have chosen any other look, but why mess with a good thing, right?

See more Kate and Pippa double-takes!