Can the CA-14 cards come mounted in Croakies?
I think they a little on the big side for croakies with the attached windscreen. I collar mount mine when I need to be discreet.
Inside the liner of a baseball hat (where it folds up inside the hat) also works great and it is 100% undetectable. I don't find that the material of the hat makes an audible difference to the sound.
I fear you are deaf...
I would be fairly certain it makes an "audible difference"
Now - whether or not that means your recording will sound like crap is a different story - you may still get acceptable results...