Have you checked w 107barney? She makes beautiful pj's to the measurements of your little one. Very reasonably priced. Here's a link to her website
Washable and reusable dog and puppy pee pads, belly bands, and diapers by T. Bumpkins & Co.. I always PM her personally to talk w her about what I want and what measurements she needs. I have a pic of Gidget in her jammies from Cathy in my album. It's not a good pic but it would give you the idea.