Springbok also offers a "between pants and belt" holster in plastic. I have no direct experience with their goods, but have read positive comments.
www.springbokinc.com
I've used several different belt slide type holsters and like them, but for best concealment (with my scrawney build) the inside the belt type holster is a clear winner. I'd second Mr. Benson's comment about the Mirage.
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Jim Fox