The clip has a hole for carabiner attachment in addition to buckle the loose belt. Attaching the carabiner and securing your zipper makes harder for pick pocket to open the zipper easily.
The template has 4mm thickness. It seems overkill for light duty clip. I recommend to scale down the thickness for seamless appearance. You can scale down the thickness using your favorite slicer.
The author remixed this model.
Add hole for carabiner attachment