You read my mind! I will definitely have to give this a try, exactly what I have been looking for!
My problem has been finding a removable IWB holster that isn't super thick and bulky. Or, they are thin but very flimsy.
I do have to say that I really like the Glock Sport/Combat Holster for OWB carry. I loop my belt around the outside of it and it sits really tight against my body. I almost always wear an overshirt, so OWB works fine for me. But I need an IWB removable holster for doggy bathroom trips and walks at night. I am not happy about having to use the .380 in a pocket holster for those quick trips outside.