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Red was Nancy Reagan’s signature color (Princess Diana even added a red pocket square while visiting the White House in her honor). The color became so synonymous with the Republican First Lady that many believe the party adopted it as its official color because of her.
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Barbara Bush did not set out to become a First Lady known for her style. While her husband was in office, she dressed for herself, focusing on comfort, but she was still known for incorporating red, white, and blue into her outfits.