How do I remove lines from clothing due to the clothing's texture?

@em_fi – When working on-screen, your only accurate view is 100% zoom, where it is 1:1 (1 image pixel mapping to 1 screen pixel).

If you need to resize the image to a different display size or print resolution and print size – then there are tricks that can be used to avoid/reduce the moiré and aliasing when resampling/interpolating new pixels. Always work on a copy of the original.

Moiré tools are often only for colour artifacts (hue/saturation) – not luminosity. Again, there are tricks to retouching and removing the luminosity moiré if it can't be avoided or reduced using tricks when resampling. Always work on a copy of the original.

This issue is called “moiré” and is an interference pattern caused by how the textile thread pattern lines up with the pixel grid on your display. How the thread pattern lines up with the pixel grid changes as you change the magnification. This also means it will look different on different displays, and if printed, may or may not appear depending on what screening technology is used by the press (because it has its own grid or halftone screen).

It’s not something I deal with much so I don’t have a quick solution, but it is a problem that photographers, videographers, and print production people have to deal with constantly, so there is info about it all over the web about it. You might start with this web search:

https://www.google.com/search?q=moir%C3%A9+in+photography