Poppy-red organic cotton-silk blend The Voluminous belted minidress from MATTEAU featuring gathered detailing, detachable belt, keyhole neck, long sleeves, side slits and thigh-length. POSITIVELY CONSCIOUS: At least 50% of the main material of this product meets our conscious criteria. For example, it's either organic, recycled, upcycled or independently recognised as being better for the environment (such as linen, ramie, TENCEL™ etc.)..