By using conductive yarn as electrodes, you can create a simple button with crochet. The construction idea is very similar to fabric button.

A solar cell or photovoltaic cell is a device that converts light directly into electricity by the photovoltaic effect. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight, while the term photovoltaic cell is used when the light source is unspecified. Assemblies of cells are used to make [...]

You can find a great selection of basic crochet tutorials online. We taught ourselves how to crochet by watching YouTube tutorial videos.

Here is the crochet pressure sensor.
The main principle is same as regular pressure sensor. Instead of conductive fabric or thread, I used conductive yarn from Schoeller, Nm 50/2 60/40 Pes/Inox @ Euros 65.00/kg (25,000 metres/kg). Since this yarn is very thin, it is mixed with normal yarn and crochet, which is what you can see [...]

Knit, pearl, stitch, weft, warp, row, gauge…

also see: collective purchase, conductive thread

also see: conductive yarn
conductive threads are usually manufactured for anti-static, electromagnetic shielding, intelligent textiles, wearable technology, data transfer and heating purposes. Most threads are metalized with an alloy of various metals, which can include silver, copper, tin and nickel. The core is normally cotton or polyester.
Conductive threads are uninsulated and sewing them tightly to metal [...]

Combination of tilt sensing and potentiometer using regular wool and conductive wool from Schoeller.

The experiment results of carbon paint painted on various stretchy fabrics. It shows resistance difference when stretched. The paints are applied by simple stencil method with sticky tapes.