Black Niagara Falls shirt that used to be my mom's when she was a teenager, gray sweats, and underwear.
And on whatever factor of people going without clothes at home, I cannot and won't do it for several reasons.
1) There's always somebody home.
2) Dad is stingy with the furnace/AC so it's (the temperature inside) always somewhat biased towards the temperature outside
3) It's uncomfortable. I won't even go without a shirt, even tank tops bother me.