Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Looks like an old wall. I guess that’s it then?
Source Viahorizon
A black tile-able background with paper-like texture.
Source V. Hartikainen
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Sharp pixel pattern, just like the good old days.
Source Paridhi
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Used a cherry by doctormo to make this seamless pattern
Source Firkin
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
This is a remix of "geometrical pattern 01".
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin