Person open carrying gun in holster sits in barber chair, then the barber places a apron over the gun concealing the gun. the barber has concealed the gun not the patron, the barber can conceal a gun in his establishment without a cpl.
I would agree with this IF...
The barber/owner removed the gun from the holster and held it in his hand the entire time while it was under the client's apron. This way the barber/owner would be in possession of the gun and not the client. This is known as IHCC.
Of course the barber owner would have to either have a CPL or a Permit to Purchase in order to lawfully "borrow" the client's gun.