Why do the Red Sox wear yellow jerseys?

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Boston Red Sox Yellow Baseball Jersey Shirt NEW Red Sox Jersey Shirt Boston Red Sox Wearing Yellow Shirt Boston Red Sox Yellow Ùniforms Red Sox Yellow Jerseys - Laughinks

Trevor Story of the Boston Red Sox hits an RBI double during the News Photo - Getty Images

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The Boston Red Sox Have Traded Their Red, White, And Blue For Banana-Colored Jerseys - Boston Uncovered

Red Sox know to wear yellow jerseys 'in case of an emergency;' Whose idea?