This recent article has some careful measurements confirming many of the things we already know about building robust connectivity into e-textiles: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5419786/ They explore the use of TPU and Silicone (NB: they annoyingly misspell Silicone in many places as “silicon”).…
Kit
Flexibility Board Design Motivations
This “nerd’s eye view” explains the motivations behind the plurifunctional features of the FlexAbility microcontroller baseboard: