The noise you hear when touching or rubbing the headphone cable against a surface (like clothing) is known as microphonics This happens when mechanical noise enters the electrical circuit of the cable, resulting in audible sound.
Here are some ways to reduce this noise:
1. Minimize cable movement
Use a clothing clip to anchor the cable to your clothing. This keeps the cable secure and reduces the chances of it rubbing against surfaces.
2. Adjust headphone placement
Experiment with how the headphones fit in your ears and how the cable hangs. Changing the angle at which the cable hangs, or routing it over the top of your ear, can help minimize noise.