I don't know what the original reason was for the Cowboys to wear white at home, but by the late 60s and early 70s, it was generally agreed that the blue jerseys were bad luck. The Cardinals, Eagles, and often the Redskins wore white at home for their games against the Cowboys for that specific reason, even though (except for the Redskins then, and the Cardinals now) they usually wore dark shirts at home.
LSU football has also had a tradition of wearing white at home.
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