As soon as I'm in the house I immediately change into my "comfy" clothes. This usually being an old, loose t shirt, leggings and trainer socks (with fake uggs when walking around). Also the hair goes up and the bra comes off. If I get chilly, I wear my grey boyfriend cardigan.
Basically, presentable enough to answer the door/go outside with the dog, but I wouldn't want to go outside and meet people like this. I'm curious what others wear to relax in around the house :)