Maid of Honor Pippa Middleton, Catherine's sister, was also in a dress by Sarah Burton of Alexander McQueen.

From the Official Royal Wedding website :

Miss Philippa Middleton's dress was designed and created by Sarah Burton at Alexander McQueen. It is of a heavy, ivory satin-based crepe, with a cowl front and with the same button detail and lace trims as the Bride's dress.

Pippa was rumored to be wearing Nicki Macfarlane along with the other bridesmaids.

Take a look at Pippa in Sarah Burton.

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