Costumes increase your Minion's stats during a run and unlock useful Costume Skills and Abilities to help you progress through the game and earn more rewards.

A Costume Skill is a passive effect that automatically gives you an advantage while playing. A Costume Ability is a Power-Up effect that you can activate once per run. You can tap on any Costume in the Wardrobe to view its stats, Skill and Ability.

For more information, check out:
<What are Costume Skills?>
<What are Costume Abilities and how do I activate them?>