Simply thread the rope through and the friction keeps in place. It tested strong enough to hold at least three trench coats while being tugged up and down.

I added two new versions of the hook that allows it to be mounted on a rope that's already in place. The v2 has centered holes and v3 has holes that are slightly off-center. I did this as I was unsure if the new cutouts in the hooks would affect the overall strength and so to compensate I moved the holes slightly to avoid straining.

Print Settings

I The model on the picture is printed at 50mm/s at 0.28 layer height and I used 3 walls with 20% infill.