pajama professional
(n.) -- a person who works from his or her home, often lounging around in pajamas all day or putting on some informal clothes as the day goes on.
"My brother in Alaska has become a certified pajama professional now; he makes a nice living from his home office and never has to wear a suit and tie anymore. I love it!"

Overheard at a watercooler in Seattle on October 25, 2009