Boo in Costume is Boo in a Randall costume. She has two eyes attached to her suit, has small arms and small legs.
Behavior During Gameplay
Similar to Boo, she waddles when she walks, she will collect 10 pixels a day, and occasionally dances.
How to Unlock
Boo in Costume can be unlocked through the first Monsters, Inc. Weekend Challenge. Complete it to unlock her.