Rod hanger with integrated pins spaced for standard melamine organizer hole spacing (32mm or about 1.26"). Most Ikea type furniture uses this spacing. You can also get hole guide jigs for this spacing on Amazon and such.
I'm using these to hold a 3/4" PVC pipe above my printer for my filament spools. You might be able to hang clothing on these but you might want to replace the printed pins with metal ones.
The printed pins are tapered so they can be pushed into the shelf wall after printing.
The model is editable publicly on OnShape.com here: https://cad.onshape.com/documents/204a93ad8e8a1366f9f61248/w/b2d4cf3974161b627596d38b/e/d04dfcae64527b7a32ce769d
1.75mm PLA, 0.4mm extruder, 0.2mm layer height, 70 mm/s draw speed, 20% infill, 4 top/bottom layers, 3 wall layers. 215 deg extruder 60 deg bed.