Fearing that his Halloween at school will be ruined because he has left his pirate outfit on the bus, Arnold uses his imagination to come up with a new costume.
Describes the work done by an African-American woman who makes wearable art, all kinds of clothes worn by actors and other performers, and costumes used in museums.
Gilbert is excited about the costume he is planning to wear in the Halloween parade at school, until he discovers that lots of others have the same costume.