Back in 1986 or 87 I was in Arizona a week or so on business. AZ did not have concealed carry then. I had anew Horseshoe Leather IWB holster.
I carried under the belt openly to comply with the law, even though it would probably be legal IWB with no cover garment. IIRC, AZ law said that IF the holster is visible the gun isn't concealed.