Well there is always Takara Jenny - Japan's official line of Barbie type dolls. There are dozens of kimono versions in various levels of elaborate - not to mention books you can get on how to make them. She's a bit shorter than Barbie, but her clothes should fit an obitsu. I know I have put Jenny clothing on my Marmot elves which are similar to obitsu.
Oh, there is also Kurhn another Chinese fashion doll. You can buy Kurhn on ebay or from China Sprout - who also carry the Yu Sai Wa dolls. http://www.chinasprout.com