We can see from the passage that Jada is wearing a costume because she would rather join in the contest than watch it.
What is costume?
A costume actually refers to the dressing that actually depicts a particular ethic group, class, nationality, tribe, etc. Costume is also used to show the cultural heritage of a group of people.
We can see from the passage that Jada actually wanted to wear a costume in order to be part of the contest and not to just watch it.
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