I found these general use clips that work great for attaching fabric to 3/4" EMT called GadgetKlip (large size). You can get on Amazon or Home Depot. They work better for me than the longer snap-on ones which are okay but can be difficult to put on and take off, and could damage fabric or other materials in the process.
https://www.homedepot.com/p/Bundling-Plant-Cord-Cable-and-Wire-Klips-Large-Black-Klips-6-Pack-GK6LBL/316356267

GadgetKlip makes other sizes too, which might fit other pipe diameters.