Well, I'm still in my PJs an hour after rising, but it's Sunday. Whether I get dressed right away or not depends on whether I have to work early or not. I work at home, but parts of the job involve leaving the house or meeting people. If none of that is involved, I usually change from PJs to sweats [to be "presentable" should anyone ring unexpectantly, or in case the UPS guy comes by]. The I generally stay in sweats until I'm done with paperwork/computer tasks, which can be an hour or several hours.
If it's Friday, my day off, and I'm writing only, then I usually change into a comfy house outfit for the morning and shower later in the day. However, some days, when I feel groggy, I'll shower right away. And if I get stuck on a problem in the book, I'll hop in the shower; I've solved some of my toughest problems in there.