How about the Sparks Watch6, two pieces of leather, thin, molds to the body, however a holster that requires you to not wear it without the pistol holstered for extended times.
To see a goodly list of holster makers:
http://www.1911forum.com/links_holsters.shtm
To see a goodly list of holster makers:
http://www.1911forum.com/links_holsters.shtm