I have used this gal in the past and was very happy with them. She makes different styles ... just do a search for her user ID. She may also be on Etsy...dont know for sure.
1 Female Dog Season Diaper Panty Skirt 11" 15" Denim | eBay
I have some that I bought a while back from T Bumpkins, but I don't know that they have them any more. You could message 107barney to ask.