I'll be the voice of dissension here
.
The first thing to change should be the BELT. A good quality
gun belt will make all the difference in the world. They are not cheap, but they are also the foundation that your carry platform is built on (disregarding pocket holsters of course). Get one that is properly made and fits properly for the type of carry it will be used for. If you get one for IWB carry it can be used for OWB but the reverse is not always true.
The Glock "plastic" holster is a serviceable holster. It will work as well or better than some of the nylon or cheap leather versions out there. It is not the most stylish accessory to carry but does what it is supposed to do, hold the gun and it fully encloses the trigger. With an appropriate cover garment CC is not that difficult using this holster as it does carry the glock high on the belt line. Dark pants and shirt also help to camouflage the holster/gun.
For the pocket holster I would recommend trying to draw the gun from that rig you have pictured a few times with it in your pocket. I'm betting that the extra mag holder is going to interfere with your draw. The idea of a pocket holster is to keep the gun orientated properly in the pocket and prevent the incursion of pocket lint/dirt/etc. from finding its way into your gun. It is a last resort piece, how often are you going to speed reload the thing? Carry the second mag in another pocket if at all.
The opinions expressed are my own and your mileage may vary.
Joat