SOS, Abba tragics look no further. Probably the most iconic Abba costume eva! Abba Cat Dress in blue. Dress up as Anni-Frid or Agnetha in this classic 70's pop music costume. Dancing Queen Cat Costume is white satin short sleeve dress with printed cat in blue featuring stuck on rhinestones, white satin belt to cinch in your waist, white boot tops to look like knee-hi boots and inflatable microphone.