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
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo