Diplomacy is stitched into the royal wardrobe - detail is key. Embroidery, for example, has highlighted relationships between nations and regions. Her coronation dress boasted British and Commonwealth emblems. When the Queen visited Ireland in 2011, her robe for the state banquet at Dublin Castle was embellished with more than 2,000 hand-sewn shamrocks. Color is more than a shade. Its symbolism may govern options.