The house dress was a shapeless garment worn by grandmothers and great aunts. Simple cotton frocks in floral prints, they were what women wore when they didn't plan on going out, when the chores of the day kept them inside, when they would never consider wearing pants.
I heard a radio report the other day on the evolution of the modern home that included this numbing statistic: In the 1920s, the average woman spent about five hours a day in the kitchen. A house dress must have been comfortable attire for scouring the oven, baking bread or running clothes through a wringer. Shapeless and liberating. No girdle required.
No woman I know wears a house dress now, unless you count some modern iterations that have little in common with their frumpy forebears. But I haven't been home five minutes when I run upstairs, slip out of my blazer and trousers and pull on my sweatpants and sweatshirt. Comfortable and shapeless, perfect for cooking, cleaning or doing nothing, they are my house dress.