a holster is only required to conceal open carry requires no holster in GA...
also a hip grip can be used id consider the clip a hip grip(it isnt defined neither is holster)
GA code link: OCGA 16-11-126 on GeorgiaPacking.org
(c) This Code section shall not permit, outside of his or her home, motor vehicle, or place of business, the concealed carrying of a pistol, revolver, or concealable firearm by any person unless that person has on his or her person a valid license issued under Code Section 16-11-129 and the pistol, revolver, or firearm may only be carried in a shoulder holster, waist belt holster, any other holster, hipgrip, or any other similar device, in which event the weapon may be concealed by the person's clothing, or a handbag, purse, attache case, briefcase, or other closed container. Any person having been issued a license to carry a concealed weapon pursuant to Code Section 16-11-129 shall be permitted to carry such weapon, subject to the limitations of this part, in all parks, historic sites, or recreational areas as defined by Code Section 12-3-10 and in all wildlife management areas