But we don’t use the word “frock” any longer, right? I found this ad in the book, Ads That Put America on Wheels. I was 8 in 1956, and I don’t remember my mom or sisters talking about their “frocks” but apparently the word was common enough for an ad writer to use it. I wonder why “frock” fell off the cliff?  What other words have? If you think of any, tell me. I’m collecting them.