There are many advantages to working at home in your jammies. Many studies, on the contrary, show that working at home in professional clothes makes one more productive. I beg to differ. Working at home in your jammies saves money AND time.
First of all, if you are a woman, there is the cost of lots of pantyhose, make-up, hair styling products, professional attire, fragrance, etc.
Then, if you are a man, there is the cost of lots of work attire, hair up-keep, shaving items, aftershave, cologne, etc.
For either, you have lots of breakfast and lunch to worry about (expensive coffee?), the cost of gasoline, a possible lengthy commute, wear and tear on tires, barely any moments with family (do you get more fast food or take-out than home-cooked meals?), up late doing laundry, expensive dry cleaning, day care or babysitter, etc.
If you work at home in your jammies, you will not have these problems. Although people might make fun of you, you will be laughing all the way with your (drumroll please)... paycheck!