When I was growing up, my mother always wore a dress—a housedress for housework and something nicer when she went out. Women wore hats, too, and so did men—hats with brims that they took off indoors.
Things were different for children, too. When adults came into the room, we were expected to stand up. And we addressed them as Mr and Mrs, not by their first names.
Another formality—strictly enforced in my home—was writing thank you notes. Even before I could write, I learned to print the words “thank you.”