What to Wear When You Write

What should you wear when you sit down to write a book? No this is not a joke.

Should you write in pajamas? Jeans and a t-shirt? Wear professional attire like you’re going in the office? Just when I though this was a silly topic to blog about, and did a search on what writers wear, I found that it’s not such a silly question after all and that others have also asked the same question.