Abstract: A concealment holster assembly, capable of being worn in multiple positions, includes a unitary shell, a belt attachment body, a forward belt loop, and a rearward belt loop. The unitary shell is capable of holstering a firearm and has a front side portion, inside portion, and outside portion. The belt attachment body is couplable to the unitary shell and is of unitary construction and includes a complementary shell portion, a forward flange, and a rearward flange. The forward flange and rearward flanges are angled inward. A forward belt loop and rearward belt loop are couplable to the forward and rearward flanges, respectively, to cause the belt attachment body, when worn on a belt, to flex inward toward a body of a wearer and increase concealment of the concealment holster and a firearm when the firearm is holstered.