A simple flex sensor 4.5" in length. As the sensor is flexed, the resistance across the sensor increases. COOL! Add it to your clothes - ideal for interfacing with LilyPad Arduino!
According to Spectra Symbol (the manufacturer), this simple 4.5" flex sensor was used in the original Nintendo Power Glove, which was one of the first cool hackable electronic toys (well, according to our old, feeble memory).
As the sensor is flexed, the resistance across the sensor increases (bending with text on inside of curve):
Connector is 0.1" spaced and bread board friendly.