Ok testing is done, now the mass production must follow :-D
It is so great to hear your design is working. Will you offer the pattern on ravelry, I could imagine it to be liked, as I have never seen such a construction before? And for the outdoor safety (I read @cryptocariad's comment) I think one could simply wear the straps beneath a shirt, then there is no risk of being caught in the bushes :-D
Love your post!!!!!!