Interesting tech but great unwashed commentards want it to die?
The application to face masks provides an obvious way to fund the concept and provide a hook to get someone to get this bulk manufacturable and cheap enough to put into production (the combo of PCB, adhesion layer and ruggedness).
Damn shame, though, if all fell through because of the sort of blank negativity expressed (so far) here.
Where else might checking fit and monitoring physiological signals, could be useful? Especially if it was mass produced and cheap to at leat try?
Safety clothing? Are there any use cases where you'd like to monitor if the cuffs of your coveralls are too loose? Is your breathing mask fitted properly whilst you're running around a smoke-filled building?
Get this tech and put into a pair of leggings (and maybe slippers?) - see if it could help monitor gait and improve physio results after a hip replacement, for example. Relatives who've had that op say they had to be repeatedly told to correct gaits that had been learnt over years and "felt natural" so they needed external feedback, but it isn't a large enough issue to warrant expensive monitoring devices.
Is your strapless gown working loose and about to get you cancelled because of a wardrobe malfunction on US TV?