Kate Middleton brought one of her current favorite pairs of pumps back to Buckingham Palace on Friday. The Princess of Wales joined Prince William for a royal garden party at Buckingham Palace in London, wearing Ralph Lauren Collection’s Celia 100mm Calfskin Pumps in the RL Gold colorway. The $750 heels have become one of her most repeated shoe choices across recent royal outings, giving her garden party wardrobe another turn in the warm tan leather style. Kate Middleton , wearing Ralph Lauren pumps, and Prince William arriving to a Royal Garden Party at Buckingham Palace, in London, on Friday. POOL/AFP via Getty Images Middleton’s pumps had a low-cut vamp, softly pointed toe and smooth calfskin upper in a golden brown shade. The Italian-made style is set on a slim 100mm heel, with a stacked horizontal grain leather finish.…