• Sucesses : It worked well when it is bend!
• Problems : It worked even after the bending force was gone. I thought that this was because the thread almost directly contact with Velostat which might stay conductive after being bended.  

***I realized the fact that the circuit was wrongly wirely afterward. The problem was actually because of the wrong wiring.

Prototype 2

To address the problem of prototype 1, I provided some space between the thread and Velostat by making  an arch form with stitches as below.