I got a guy in Texas named Ed Buffaloe to make an IWB holster for the 1908. The holster is lined with soft pigskin to protect the pistol's finish. It fits the gun perfectly and snaps on the belt loops to make it easier to put on. You can go to his website "unblinkingeye.com" and see some of his work. Here is a picture of an IWB holster that he made for my Colt Detective Special.
The revolver in the pictue is a Colt Agent, but other than the grip, it is the same size as the Det. Spec.