Several years ago I worked for a direct sales cosmetics company. One main rule for that company was that you could not make a single phone call in the morning unless you were totally dressed all the way to dress shoes. The reason behind this duty was that you act differently when you have clothes and shoes on. You are more professional. The customer can tell when you don't feel good about the way you look. So, if getting dressed makes that big of an impression on someone that can't even see you, then what is it going to do to those who can see you. Mainly yourself.