Several ways to find out this information.
1. Search the anime costumes forum for the Bleach thread. Read it. Yes, it's very long. Try clicking on the purple link above once your'e in it to search the thread for "kimono pattern" or something.
2. Search the forums for "kimono pattern" or "Hakama pattern".
3. Search google for "kimono pattern" or "Hakama pattern".
4. Try searching forums for "bleach costume", or "renji", or "Renji costume" or something.
5. Go to the pattern websites and search for a kimono pattern that you can work from or modify.
www.simplicity.com,
www.mccall.com (mccalls, butterick, vogue). Simplicity, mccalls, and butterick have one or two each, some are better than others. Then there's the more historically accurate Folkwear pattern (
www.folkwear.com).
Yes, it's more work than having someone hand you the links, but you'll learn more about the site and possibly about the costume and the clothing if you do it on your own.
If you need help on how to search the cosplay forums, I have a link in my sig to a post that explains it.