Hi,
M-P, very impressive! How long did you work on that one?
whatareyadoin, I just tried to explain how to make such a harness, but it sounds terribly complicated. I think I better take some detail photos who explain themselves.
The harness can be adjusted to every size (to wear it as well over a t-shirt or a thick jacket) which makes the building a bit more difficult. A fixed size would be very easy to build.
Radon