Final answer:
Without specific context from a story or book, it's impossible to provide a definitive answer about Alexis stealing a dress. The excerpts discuss Amy's connection with dresses and their impact on her identity, but do not mention Alexis.
Step-by-step explanation:
The question about Alexis stealing a dress is related to a story plot and character development, thus falling under the category of Literature within the subject of Arts at a high school level. However, without specific context from a story or book, it is impossible to provide a definitive answer to who Alexis stole the dress from. Given the provided excerpts, Amy's experiences with dresses in various texts offer rich exploration into character identity and expression. The fascination with costume in the first excerpt highlights the importance of appearance in shaping Amy's racial identity. In another excerpt, a woman named Savanna is mentioned, suggesting an incident involving a strip search, though this situation does not directly provide evidence of theft or link to the dress in question. Therefore, without further context, an accurate answer regarding Alexis cannot be given.