Thanks everyone!

Those Rainshed patterns look pretty complex. I was thinking something more minimalist like, for example, a Helium II or a Hypershell look-alike, though I'd be conflicted on whether or not to add pockets. It's nice to have a place to rest and warm your hands.

Something tells me I wouldn't be happy with it without some R&D, which I currently do not have time for, so this idea will go on the shelf for now.