The Question and Answer section for The Watsons Go to Birmingham - 1963 is a great resource to ask questions, find answers, and discuss the novel.
What is your question here?
Byron told her that the reason Mama made them wear so many layers was to keep them from freezing..... that because she was from the South..... half her blood was real thin. Thus, is she didn't dress warmly enough she might freeze and get thrown...
Byron had nowhere to run to.