I used to carry a Walther PPK/S which is of similar design to the CZ83.
I experimented with a few different Holsters. First I tried a Pocket Holster, then a Shoulder Holster, followed by an OWB Holster, but I was never really comfortable with any of them. In hindsight, the Shoulder Holster was probably the best of them all, but it was also my least favorite way to carry it.
Ultimately, I retired the PPK/S in favor of the smaller, lighter, Ruger LCP, which I carry in a Pocket Holster.
If I were to carry the PPK/S again as an EDC, then I would probably get a nice Leather IWB Holster then carry it at a 4:30 position, as I imagine that would be the best, most comfortable way to carry it.