Explore our curated edit of the best party dresses from COS, ARKET, Boden, REISS, Rixo and Self Portrait. Sleek evening dress, sequin mini or romantic lace midi? From asymmetric and bubble hems to elegant draping, sumptuous velvet, luxe satin, playful ruffles and frills, sheer tulle and puff sleeves, these are the statement styles made for every celebration.