Friday’s Buckingham Palace garden party featured senior members of the British royal family wearing their springtime best. From Kate Middleton to Zara Tindall, shades of blue, polka-dot patterns and more were aplenty on the green lawn of the London palace. Roland Mouret and Self-Portrait were among the designers and labels featured on British royal women for Friday’s festivities, with additions of seasonal motifs that set each royal apart from the other. WWD breaks down those looks and more ahead. Kate Middleton Kate Middleton Getty Images Kate Middleton favored London-based luxury brand Self-Portrait for her attire to Friday’s garden party. The Princess of Wales wore a cream three-dimensional floral polka-dot midi dress, crafted with a streamlined bodice with three-quarter-length sleeves and a double-breasted fit with black buttons. A belt was added at the waist for further silhouette definition.…