also see: Materials >> Conductive Threads
You can’t solder to most conductive threads, but there are conductive threads that are actually made by spinning very thin flattened wire around a soft, flexible core, and these are great for soldering to.

These sensors measure pressure and can also be designed and placed to measure bend. They work on the simple principal that Velostat reacts to pressure with a decrease in electrical resistance. When sandwiched between two conductive layers, this change in resistance can be easily measured and used as an indication of how much pressure is [...]

Four separate pressure sensors not only give feedback about where I’m pressing, but also how hard.

Combining beads and other decorative elements with conductive textiles to create tilt sensitive designs. A bracelet decorated with six conductive fabric petals and a row of beads with a metal bead on the end, makes for a simple six point tilt detection. It is also designed so that the metal bead will make contact with [...]

also: neoprene pressure sensor, conductive thread Pressure Sensor
Stitching conductive thread into neoprene to create a pressure sensitive pad. This sensor is very similar to the Fabric bend sensor or vis-versa. And also close to the Fabric Pressure Sensor, but the difference is that the conductive surface is minimized by stitching only a few stitches on [...]

also: neoprene bend sensor, conductive thread Bend Sensor, Bend Sensor (thread)
This bend sensor actually reacts (decreases in resistance) to pressure, not specifically to bend. But because it is sandwiched between two layers of neoprene (rather sturdy fabric), pressure is exerted while bending, thus allowing one to measure bend (angle) via pressure.