Wore the Thermawrap Parka into the hospital tonight...
you will be remiss if you dont consider what Montbell is doing in their synthetic insulations. I promise you will be very surprised at the amount of heat it can retain. So much in fact that I incorporated the original Thermawrap jacket into my sleep system to decrease the amount of 'bag' i have to carry. I got a pair of pants from Japan when they werent available in the US to complete the system...good stuff and of high quality. Th parka i wore in is in the gunmetal color----dont get it, a mistake i made, its very shiny, might fit in better in Times Square
bordering on another good point
why not carry the vest too? i've always carried a 'sleep vest', a vest i doubly wrap to gaurantee it is kept dry to sleep in, since a vest is so good at keeping the core warm. for years i carried a patagonia puffball but now its the thermawrap....i havent used it with the parka but i'm thinking it is a superwarm combo.
just get the whole system
parka, pants, and vest
you will love them all