Thanks for the replies.
About how wide is the opening? I'm imagining a fairly wide opening, but that makes me think it would make the front of the pocket droop in an ugly way. (And a way that would over time distress the material)
Pass through pockets are a great idea!
I'm thinking of getting a fur lining in the pockets (handwarmers) and maybe there's a passthrough in the bottom of the pocket with a zipper closure in there on one side. Or do you think its better to make...