Tommy Theis (http://theisholsters.com/index.php
) makes a kydex/horsehide IWB for the Chief's Special in .40. I don't know what, if any, dimensional differences there are between the .40 and the .45, though. I use a Theis holster and have been very happy with it.
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.