I have started wearing this lounging pant from Raffi and it is the finest I have ever owned.  It goes on every night when I get home from work and is also very adaptable to a casual night out.

 

 Here is the description from the Raffi website. 

"When you need to kick back and relax, do it in style with The Andrew, our 100% Aqua Cotton lounge pants. Our breathable, comfortable material will have you feeling cozy, chill, and looking so good you'll want to wear these pants all the time."