Note that various things have been called a "housedress." This type is for schlubbing around the house or neighborhood in comfortable clothes. Another type is similar to a nightgown; this is not that. A housecoat is more like a bathrobe, but sometimes people call it a housedress, though it isn't quite the same.
The historic tea dress was a related concept, meant to wear without a corset while entertaining guests at home.
See Linen Big Sale and the Vermont Apron Company for ideas. Allfreesewing has many dress patterns. Here's one for a summer lounge dress. There are free apron patterns too.