Usually a pair of cords and a t-shirt and sweater/fleece, although I'm trying to come up with a more presentable standard for home-wear. My wife often just wears yoga pants and a t-shirt/sweater combination, so it's not a great incentive. She dresses slightly better for work than I do, so likes to be more comfortable off-hours. As I'm often cooking or doing other chores evenings and weekends, I don't want to wear anything that would be damaged or get too dirty. However, I keep joking with my wife that soon I'll get a complete tweed 3-piece suit in order to be properly presented while gardening outdoors.