Thursday is Eric's night out, where he can go hang out, and I take care of the boys all evening (like Monday nights for me). Since I am home the entire day/evening, Thursdays are generally pretty casual. The only place I usually go is downstairs to visit the daycare.
My staple "stay home" outfit is a tank or t-shirt and cardigan. It's just so easy, and it if I get warm, I can just take the cardigan off, and vise versa.
Tank: Homemade combination of a t-shirt and tank
Jeans: H & M