Thank you, you've been most productive here.

Bostontrevor, I believe that you have summed it up nicely - this is a solution in search of a problem. The heated socks and gloves are just an example of searching too deeply for some useful application (although they would be handy, there's no need for cycling-specific equipment in this case). It's doable, but the need for such a system would be created by marketing. I do like the idea of a modular vest system, and especially having plenty of available pockets.

catatonic, you can't really have something that's reflective without it looking reflective... besides, why would you want to? That yellow vest is so fashionable!