While we're no stranger to Kate Middleton's well-executed outfit repeats, this particular exercise in wedding guest attire proved a compelling case for wearing shades of gray. Over the weekend, the Duchess of Cambridge attended the wedding of Princess Diana's niece, donning not one, but four pieces we've seen her in before. Apart from her ability to breathe new life into beloved wardrobe staples, we love that she opted to mix and match pretty dove gray-hued pieces for the occasion. She paired her silky floral-infused Jenny Packham sheath — first debuted at a polo match in Santa Barbara last July — with her custom-made Katherine Hooker coat, which was first seen at last June's Order of the Garter service.To add a polished flair to the neutral gray tones, she added a Whiteley Hat Company fascinator (that she first rocked at last year's Epsom Races) and her go-to nude LK Bennett pumps. Kate's cool approach to wedding guest style has us convinced that we, too, can pull off a pared-down sophisticated take on grays. On the bandwagon? Shop our editors' picks below now.