Lovely dress, by Boden.  Definitely NOT a 6R though - Boden sizing is awful sometimes.  White with dark red, pink and green.
Bust 36"
Hips 39"
Underarm to hem 27"
Cotton Tencel mix - a fairly light jersey.  Sleeveless and pullover to get on and off.  Finishes above the knee.

Postage via Royal Mail second class.