When in doubt, wear a black mini dress. Stella McCartney's sexy wool blend short-sleeve mini dress is your go-to staple for those fun nights in the city. A dress to impress. Featuring a round neck, a back zip fastening, a fitted waist and a flared skirt. POSITIVELY CONSCIOUS: We’ve joined forces with ethical agency Good On You to give you the power to choose positively. This piece is from a brand that scores well on their key criteria.