Which stretchable conductive fabric to be use for posture detection

Hello Sir/madam
I am working on Posuure recogniton/Activity level classification.please help me on this like which fabric i need to use  or please suggest me how to proceed with it. i was using this fabric but it is more sensitive and change its resistance every time when we stretch it and there is no constant increase or decrease in stretchingand after washing also there is huge difference in the resistance value.please anyone can suggest me which fabric to be use for this application.
https://www.tanotis.com/products/sparkfun-eeontex-conductive-stretchable-fabric?gclid=Cj0KCQjwi97NBRD1ARIsAPXVWWAjOVpJlmVfjxULdvjhI_7v-dGI4plgZtfPhkkjdEeANLk9acYoHVUaAmo8EALw_wcB&variant=42402339152

Picture of Which stretchable conductive fabric to be use for posture detection