I would take a stab at that since I love vests but can't find the one I like...

Outside nylon/gore tex waterproof shell... Double stiched, sealed. Inside has to be fleece lined (polartec). Or it has to be down filled.

Pockets:
4 pockets in the front with lap closures, two more pockets that you can just slide you hands in. One breast pocket that is zipper closed for small items. One pocket on the back.
3 pockets on the inside. It would be good to have a small flashlight pocket.

Heavy duty zipper. Storm or water guard that would extend over the zipper and can be locked in place. Possibly hood stored in the collar.

Minimal use of velcro.

As far as the colors go... Outside should be in passive non agressive tone. Inside should be in bright orange. Questionable idea would be to add reflective stripes all around.

If I took my mountain hardware down filled vest, crossed it with TAD gear fleece and some of my acteryx vests and jackets I would get a perfect product.

Matt