Samantha Cameron wears Pour Moi? Black Bikini

Direct links:

http://www.shoppourmoi.co.uk/6495/Pour-Moi/Azure-Padded-Top/?styleid=9299

http://www.shoppourmoi.co.uk/6496/Pour-Moi/Azure-Tie-Side-Pant/?styleid=9305

Also available in green, navy, reef blue, amethyst, orange, red, stone and  white.