Complete all levels of the mini-game indicated to unlock the costume for purchase...

Action Hero - Drum Topple (using a male player).
Bowling clothes - Pin Crusher mini-game.
Karate clothes - Avalanche mini-game.
Mariachi clothes - Block Buster.
Mime - Count Mania (using a male player).
Pajamas - Court Curling.
Pirate costume - Pirate Wars.
Sheriff Uniform - Pot Shot.
Skeleton clothes - Block Buster mini-game.
Superhero costume - Shopping Dash mini-game.
Zookeeper clothes - Zoo Feeder mini-game.