There's virtually no easier costume option than putting on a hat. With this purchase, you'll get two costume fish hats that make a great Finding Nemo inspired costume starter for a couple or a pair of friends.
The orange fish hat looks like an Anemone Clownfish, the same species as Marlin and his lost son, Nemo. The blue fish hat is a Blue Tang, the same species as Marlin's friend in adventure Dory. These are one-size-fits-most hats that can be worn alone or as part of a more complete costume look. One easy option is to match the fish's colors with your outfit. You could also go all-out and wear an anemone- or coral-inspired outfit to match the fishes to their natural habitat.
The hats are lightweight, making them comfortable to wear all day and night.