Whether it’s bonbons fit for a queen or princely tailoring, Buckingham Palace awards its favorite retailers with Royal Warrants. Here, three that also get T+L’s stamp of approval. Charbonnel et Walker, known for its dusted truffles and chocolates, has supplied the palace since Mme. Charbonnel arrived from France in 1875. Gieves & Hawkes, a maker of suits, shirts, and ties, outfits Charles and Philip, and Partridges is the go-to grocery for staples of aristocratic life, from lemon shortbread to English Breakfast tea.