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Be careful wearing an IWB holster without a gun. If it is a molded holster, without a gun, you can take the shape out of the holster pressing it against your body and pants.

This is from UBG Holsters, Care Instructions http://ubgholsters.com/care.htm" onclick="window.open(this.href);return false;
5. Never allow your holster to be flattened. The molding procedure leaves the holster 3
dimensional and it needs to stay this way. If it becomes flattened at any point, you can expect it to stay flattened.

6. If you need to remove your gun, for more than a brief moment, remove your holster from your
body. Without your gun, your holster will be more apt to become flattened and lose its rigidity. This is especially important if you wear your belt cinched tight or anticipate sitting or bending over without your gun in the holster.