THIS OLD THING? Kate Middleton has shopped her closet yet again for the wedding this past weekend of pals Harry Aubrey-Fletcher and Sarah Louise Stourton in north Yorkshire, England. Middleton, whose fiancé Prince William took part in the wedding, wore the same black dress with a sheer top that she chose for the nuptials of William’s cousin Peter Phillips to Autumn Kelly in 2008. On top, she wore a velvet silk coat from the London-based label Libélula. The coat, which has a brooch-like diamanté clasp at the waist, is from the fall 2010 collection and costs 310 pounds, or $484 at current exchange. Libélula was launched in 2003 and is designed by Sophie Cranston, who has worked for Alexander McQueen, and who set up Temperley with Alice Temperley. This isn’t the first time Middleton has trotted out an old frock: For her engagement photo in December, she donned a dress from Reiss and a blouse from Whistles, both from the British retail brands’ past seasons.