I'm still seeing ESB guys hanging the holster on the ammo belt (and getting a stretched out, droopy looking belt). RafalFett did some research a while back and created these photos, which we believe show the sidearm hanging on the harness (or diver's belt). This may not be news to some of you guys, but I just wanted to spread the word that there is a more accurate and secure way to hang your sidearm. You can see from other reference photos the loop for the holster goes under the ammo belt, not around it.
I don't take credit for these photos, it was all Raf.
I'm not sure of the practicality of costuming like this, because the diver's belt has to be positioned lower than guys normally wear it (under the ammo belt).
You could perhaps add an additional hidden belt under the ammo belt for these purposes.