Organic Cotton Navy Midi Dress. Want to look fab while at the same time be sustainable with your fashion look? Check out this stunning organic cotton navy midi dress from People Tree. This chic navy number is made from 95% organic certified cotton. Its design includes form-fitting midi style with a Bardot neckline, with side slits to the skirt for ease of movement. For that Christmas party or family get together, this is perfect. Whack on a pair of neutral heels and you are all set to look sleek. This is sustainable fashion at its best.