Final answer:
The story's fascination with costume suggests that Amy's racial identity is a prominent theme in the story.
Step-by-step explanation:
The story's fascination with costume suggests that Amy's racial identity is a prominent theme in the story. By focusing on Amy trying on an expensive gown in a dressmaker's shop, the story highlights her desire to fit into a higher social class and be accepted by society. This indicates that Amy may be from a lower socioeconomic background, and her interest in costume reflects her aspirations and challenges related to her racial identity.