I saw this dress on Pinterest and it's titled as being a suit Nancy Reagan wore. I haven't been able to find any photographs of her wearing it just yet, but I'm still looking. I am saddened to hear of Nancy's passing this morning, but it makes me happy to think she's with Ronnie again. He was truly the love of her life. Ronald was known to wear plaid many times as well. They will both be sorely missed.
ETA: I found Nancy wearing her red plaid suit on a tribute video from KTLA. Click here to watch it. It's a great tribute to Mrs. Reagan.